drm/xe: Keep all resize bar related prints inside xe_resize_vram_bar

drm/xe: Keep all resize bar related prints inside xe_resize_vram_bar

xe_resize_vram_bar() function is already printing the status of bar
resizing. It has prints covering both success and failure.
There is no need of additional prints in the caller which were not so
easily to follow.

Modified all BAR size prints to consistently print the size in MiB.

Signed-off-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>