evdi-dkms DKMS FTBFS wrt Linux 6.3

[Impact]

evdi-dkms FTBFS wrt Linux 6.3:

...
/home/ubuntu/dkms/evdi/evdi-1.12.0+dfsg/module/evdi_encoder.c: In function ‘evdi_encoder_init’:
/home/ubuntu/dkms/evdi/evdi-1.12.0+dfsg/module/evdi_encoder.c:52:34: error: invalid application of ‘sizeof’ to incomplete type ‘struct drm_encoder’
   52 | encoder = kzalloc(sizeof(struct drm_encoder), GFP_KERNEL);
      | ^~~~~~
/home/ubuntu/dkms/evdi/evdi-1.12.0+dfsg/module/evdi_encoder.c:56:15: error: implicit declaration of function ‘drm_encoder_init’; did you mean ‘evdi_encoder_init’? [-Werror=implicit-function-declaration]
   56 | ret = drm_encoder_init(dev, encoder, &evdi_enc_funcs,
      | ^~~~~~~~~~~~~~~~
      | evdi_encoder_init
/home/ubuntu/dkms/evdi/evdi-1.12.0+dfsg/module/evdi_encoder.c:63:9: error: implicit declaration of function ‘drm_encoder_helper_add’ [-Werror=implicit-function-declaration]
   63 | drm_encoder_helper_add(encoder, &evdi_enc_helper_funcs);
      | ^~~~~~~~~~~~~~~~~~~~~~
/home/ubuntu/dkms/evdi/evdi-1.12.0+dfsg/module/evdi_encoder.c:65:16: error: invalid use of undefined type ‘struct drm_encoder’
   65 | encoder->possible_crtcs = 1;
      | ^~
...

[Fix]

Apply the attached patch.

[How to test]

Install the packet.

[Regression potential]

None, the fix is conditionally compiled thus doesn't affect anything below Linux 6.3.