WLAN - compat_wl12xx: more file cleanups

- Remove unused files from compat
- Update Makefile accordingly

Change-Id: I65acbe7ee8063c082a1877ac7f668287f6ba15cd
Signed-off-by: Vishal Mahaveer <vishalm@ti.com>
Merge "WLAN - compat_wl12xx: more file cleanups" into cm-10.2