drm/i915/display: remove enum macro magic in intel_display_wa()

drm/i915/display: remove enum macro magic in intel_display_wa()

There's not much use in passing a number to the macro and let it
convert that into the enum and a string.  It just hides the symbols.

Remove the number to enum conversion magic in intel_display_wa().

This has the side-effect of changing the print in the drm_WARN() that
is issued when the number is not implemented, but that is moot anyway
and can be changed later to something cleaner if needed.

Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20260305100100.332956-2-luciano.coelho@intel.com
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>