drm/xe: pull resizable bar support from i915
Bring i915 resizable bar support from this tree (issue #91 (closed) and issue #112 (closed)) - on top of !197 (merged)
But I face trouble to test it... looks like my setup doesn't' support it, while it is visible from lspci..
[ 835.527490] xe 0000:03:00.0: [drm] lmem_size: 0x380000000 flat_ccs_base: 0x37a800000 remove_len: 0x5800000
[ 835.527518] xe 0000:03:00.0: [drm] Can't resize LMEM BAR - platform support is missing
[ 835.527529] xe 0000:03:00.0: [drm] TOTAL VRAM: 0x0000006800000000, 0x000000037a800000
[ 835.527530] xe 0000:03:00.0: [drm] VRAM: 0x000000037a800000