1.9.1-1ubuntu4 fails to compile with Kernel 5.14

[Roland Tapken]

Package evdi 1.9.1-1ubuntu4 fails to compile with Kernel 5.14 from mainline repository:

/var/lib/dkms/evdi/1.9.1/build/evdi_painter.c: In function ‘evdi_log_pixel_format’:
/var/lib/dkms/evdi/1.9.1/build/evdi_painter.c:738:29: error: storage size of ‘format_name’ isn’t known
  738 | struct drm_format_name_buf format_name;
      | ^~~~~~~~~~~
/var/lib/dkms/evdi/1.9.1/build/evdi_painter.c:740:2: error: implicit declaration of function ‘drm_get_format_name’; did you mean ‘drm_get_format_info’? [-Werror=implicit-function-declaration]
  740 | drm_get_format_name(pixel_format, &format_name);
      | ^~~~~~~~~~~~~~~~~~~
      | drm_get_format_info
/var/lib/dkms/evdi/1.9.1/build/evdi_painter.c:738:29: warning: unused variable ‘format_name’ [-Wunused-variable]
  738 | struct drm_format_name_buf format_name;
      | ^~~~~~~~~~~
cc1: some warnings being treated as errors