Windows graphic driver obtains DSM address from in-BAR mmio register
which has passthroughed. Not like the other platforms obtained from
pci configure space register which has virtualized. GPU GuC must use
WOPCM in DSM, besides, Windows OS wants to manage DSM also. These two
reason force acrn has to keep identical mapping to avoid trap mmio
BAR to do the emulation.
Tracked-On: #5880
Signed-off-by: Peng Sun <peng.p.sun@intel.com>