drm/xe: Standardize power gate registers

Standardize power gate registers

No functional changes

v2: change commit message (Rodrigo)

Signed-off-by: Riana Tauro <riana.tauro@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240524070916.143022-2-riana.tauro@intel.com


Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>