drm/i915/psr: Write PSR2_MAN_TRK_CTL on DSB commit as well

Add PSR2_MAN_TRK_CTL writing into DSB commit in intel_atomic_dsb_finish.

Taking PSR lock over DSB commit is not needed because PSR2_MAN_TRK_CTL is
now written only by DSB.

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250213064804.2077127-8-jouni.hogander@intel.com