Staging: android: add __user annotation in binder.c
This fixes the following sparse error
drivers/staging/android/binder.c:1795:36: error: incompatible types in
comparison expression (different address spaces)
Staging: android: Mark local functions in binder.c as static
This fixes the following sparse warnings
drivers/staging/android/binder.c:1703:5: warning: symbol
'binder_thread_write' was not declared. Should it be static?
drivers/staging/android/binder.c:2058:6: warning: symbol
'binder_stat_br' was not declared. Should it be static?