drm/amdgpu: Fix errors & warnings in gfx_v10_0.c

Fix the below checkpatch errors & warnings:

ERROR: that open brace { should be on the previous line
ERROR: space prohibited before that ',' (ctx:WxV)
ERROR: space required after that ',' (ctx:WxV)
ERROR: code indent should use tabs where possible
ERROR: switch and case should be at the same indent

WARNING: please, no spaces at the start of a line
WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
WARNING: space prohibited before semicolon
WARNING: Block comments use a trailing */ on a separate line
WARNING: Block comments use * on subsequent lines
WARNING: braces {} are not necessary for any arm of this statement
WARNING: Missing a blank line after declarations

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: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>