Staging: MSM: remove duplicated #include

Remove duplicated #include('s) in
  drivers/staging/msm/mddihost.h
  drivers/staging/msm/msm_fb_def.h
  drivers/staging/msm/staging-devices.c

Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>