drm/buddy: Fix drm buddy info output format

[1] Change pages to blocks to avoid confusion.
[2] Fix output format to align the output info.

Signed-off-by: Ma Jun <Jun.Ma2@amd.com>
Reviewed-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>