drm/amd/amdgpu: Simplify switch case statements in amdgpu_connectors.c

Fix the following checkpatch errors:

ERROR: trailing statements should be on next line
ERROR: space required after that ',' (ctx:VxV)
ERROR: code indent should use tabs where possible

Cc: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>