Implement PCI bar resizing

Bumped into a RIL system with DG2 that did not had resizable bar enabled and got some warnings when loading Xe. I believe that at this point would be better to not let driver load in such devices until Xe has small PCI bar support.

[   87.167654] resource sanity check: requesting [mem 0x6080000000-0x61fdffffff], which spans more than PCI Bus 0000:01 [mem 0x6080000000-0x60907fffff 64bit pref]
[   87.167679] caller xe_mmio_init+0x1af/0x3a0 [xe] mapping multiple BARs