drm/radeon/ci_dpm: Clean up errors in ci_dpm.c

Fix the following errors reported by checkpatch:

ERROR: that open brace { should be on the previous line
ERROR: need consistent spacing around '-' (ctx:WxV)
ERROR: space required before the open parenthesis '('
ERROR: "foo* bar" should be "foo *bar"

Signed-off-by: GuoHua Chen <chenguohua_716@163.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>