drm/i915/psr: Add register definitions for SFF_CTL and CFF_CTL registers

Add register definitions for SFF_CTL and CFF_CTL registers. Name them as
LNL_SFF_CTL and LNL_CFF_CTL.

v2: use _MMIO_TRANS instead of _MMIO_TRANS2

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250213064804.2077127-5-jouni.hogander@intel.com