drm/i915/dsb: Add support for GOSUB interrupt

drm/i915/dsb: Add support for GOSUB interrupt

DSB raises an interrupt when there is a nested GOSUB command or
illegal Head/Tail. Add support to log such errors in the DSB
interrupt handler.

v2: Enable support only in platforms that support this (Ville)

Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Animesh Manna <animesh.manna@intel.com>
Link: https://lore.kernel.org/r/20250523062041.166468-7-chaitanya.kumar.borah@intel.com