drivers: staging: android: split uapi out of binder.h

Move the userspace interface of binder.h to
drivers/staging/android/uapi/binder.h.

Change-Id: I2e56ba89ade5e1f33b121e6ecd456392d588a14e
Signed-off-by: Colin Cross <ccross@android.com>
Git-commit: 06f505a4d5719da00e76bde885792a7d5ec968f8
Git-repo: https://android.googlesource.com/kernel/common/


Signed-off-by: Neeti Desai <neetid@codeaurora.org>
Signed-off-by: Ajay Dudani <adudani@codeaurora.org>