drm/i915/psr: PSR2_CTL[Block Count Number] not needed for LunarLake

PSR2_CTL[Block Count Number] is not used by LunarLake do not configure it.

Bspec: 69885

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240517073005.2414293-4-jouni.hogander@intel.com