drm/xe: Fix PVC RPe and RPa information

drm/xe: Fix PVC RPe and RPa information

[ Upstream commit 8a734b9359cfa1bdb805f5ca23e20bd99dd18a0a ]

A simple lazy buggy copy and paste of the PVC comment has brought
the attention to the incorrect masks of the PVC register for RPa
and RPe. So, let's fix them all.

Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Reviewed-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250109195219.658557-1-rodrigo.vivi@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>