[MOS] Fix SIGBUS crash on xe small BAR systems during vaInitialize#1990

KevinKickass wants to merge 1 commit intointel:masterintel/media-driver:masterfrom

KevinKickass:fix/small-bar-vram-visible-flagKevinKickass/media-driver:fix/small-bar-vram-visible-flagCopy head branch name to clipboard