Wily update to v4.2.5 stable release

SRU Justification

    Impact:
       The upstream process for stable tree updates is quite similar
       in scope to the Ubuntu SRU process, e.g., each patch has to
       demonstrably fix a bug, and each patch is vetted by upstream
       by originating either directly from Linus' tree or in a minimally
       backported form of that patch. The v4.2.5 upstream stable
       patch set is now available. It should be included in the Ubuntu
       kernel as well.

       git://git.kernel.org/

    TEST CASE: TBD

       The following patches are in the v4.2.5 stable release:

net/ibm/emac: bump version numbers for correct work with ethtool
l2tp: protect tunnel->del_work by ref_count
af_unix: Convert the unix_sk macro to an inline function for type safety
af_unix: return data from multiple SKBs on recv() with MSG_PEEK flag
net/unix: fix logic about sk_peek_offset
skbuff: Fix skb checksum flag on skb pull
skbuff: Fix skb checksum partial check.
net: dsa: fix preparation of a port STP update
inet: fix races in reqsk_queue_hash_req()
net: add pfmemalloc check in sk_add_backlog()
ppp: don't override sk->sk_state in pppoe_flush_dev()
inet: fix race in reqsk_queue_unlink()
bpf: fix panic in SO_GET_FILTER with native ebpf programs
ovs: do not allocate memory from offline numa node
act_mirred: clear sender cpu before sending to tx
bpf: clear sender_cpu before xmit
ipv6: Don't call with rt6_uncached_list_flush_dev
ethtool: Use kcalloc instead of kmalloc for ethtool_get_strings
tipc: move fragment importance field to new header position
netlink: Trim skb to alloc size to avoid MSG_TRUNC
drm: Fix locking for sysfs dpms file
crypto: sparc - initialize blkcipher.ivsize
crypto: camellia_aesni_avx - Fix CPU feature checks
crypto: ahash - ensure statesize is non-zero
memcg: convert threshold to bytes
btrfs: check unsupported filters in balance arguments
btrfs: fix use after free iterating extrefs
arm64: errata: use KBUILD_CFLAGS_MODULE for erratum #843419
ARM: ux500: simplify secondary CPU boot
nfsd/blocklayout: accept any minlength
mfd: max77843: Fix max77843_chg_init() return on error
i2c: rcar: enable RuntimePM before registering to the core
i2c: s3c2410: enable RuntimePM before registering to the core
i2c: designware: Do not use parameters from ACPI on Dell Inspiron 7348
i2c: designware-platdrv: enable RuntimePM before registering to the core
workqueue: make sure delayed work run in local cpu
KVM: x86: clean up kvm_arch_vcpu_runnable
KVM: x86: fix SMI to halted VCPU
KVM: x86: fix RSM into 64-bit protected mode
drm/qxl: fix framebuffer dirty rectangle tracking.
drm/nouveau/fbcon: take runpm reference when userspace has an open fd
drm/dp/mst: make mst i2c transfer code more robust.
drm/radeon: attach tile property to mst connector
drm/radeon: add pm sysfs files late
drm/amdgpu: add pm sysfs files late
drm/amdgpu: fix num_crtc on CZ
drm/amdgpu: check before checking pci bridge registers
drm/amdgpu: Keep the pflip interrupts always enabled v7
dm thin: fix missing pool reference count decrement in pool_ctr error path
rbd: fix double free on rbd_dev->header_name
timekeeping: Increment clock_was_set_seq in timekeeping_init()
pinctrl: imx25: ensure that a pin with id i is at position i in the info array
arm64: Fix THP protection change logic
svcrdma: handle rdma read with a non-zero initial page offset
Linux 4.2.5