staging: android: binder.c: binder_ioctl() cleanup

binder_ioctl() is quite huge and checkpatch dirty - mostly because of
the amount of code for the BINDER_WRITE_READ and BINDER_SET_CONTEXT_MGR.
Moved that code into the new binder_ioctl_write_read() and
binder_ioctl_set_ctx_mgr()

Change-Id: I0fe0a7f59ea04c0232353cb06b1264c6efb7bac9
Signed-off-by: Tair Rzayev <tair.rzayev@gmail.com>
Cc: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-commit: 78260ac625e91d2402d72dd2f8c7109f98c1d19a
Git-repo: https://android.googlesource.com/kernel/common


[spathi@codeaurora.org  resolved trivial merge conflicts]
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>