drm/i915/mtl: Obtain SAGV values from MMIO instead of GT pcode mailbox

drm/i915/mtl: Obtain SAGV values from MMIO instead of GT pcode mailbox

From Meteorlake, Latency Level, SAGV bloack time are read from
LATENCY_SAGV register instead of the GT driver pcode mailbox. DDR type
and QGV information are also to be read from Mem SS registers.

v2:
 - Simplify MTL_MEM_SS_INFO_QGV_POINT macro(MattR)
 - Nit: Rearrange the bit def's from higher to lower(MattR)
 - Restore platform definition for ADL-P(MattR)
 - Move back intel_qgv_point def to intel_bw.c(Jani)
v3:
 - Rebase

Bspec: 64636, 64608

Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Original Author: Caz Yokoyama
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220902060342.151824-9-radhakrishna.sripada@intel.com