drm/amdgpu: Cleanup inconsistent indenting in 'amdgpu_gfx_enable_kcq()'

Fixes the below:
drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c:645 amdgpu_gfx_enable_kcq() warn: inconsistent indenting

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