drm/amd/display: fix typo in the comment

Correctly spelled comments make it easier for the reader to understand
the code.

Replace 'maxium' with 'maximum' in the comment &
replace 'diffculty' with 'difficulty' in the comment &
replace 'suppluy' with 'supply' in the comment &
replace 'Congiuration' with 'Configuration' in the comment &
replace 'eanbled' with 'enabled' in the comment.

Signed-off-by: Yan Zhen <yanzhen@vivo.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>