drm/i915/mtl: Fix PSR2_MAN_TRK_CTL bit getter functions for MTL

MTL shares PSR2_MAN_TRK_CTL bits with ADL. Currently some bit
getter functions are incorrect for MTL. This patch fixes those.

Bspec: 49274

Cc: José Roberto de Souza <jose.souza@intel.com>
Cc: Mika Kahola <mika.kahola@intel.com>
Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com>

Fixes: 47d4ae21 ("drm/i915/mtl: Extend PSR support")
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221101115342.1136720-1-jouni.hogander@intel.com