staging: Fix build issues with new binder API

The new 64bit binder API causes build issues on 32bit ARM
due to the lack of 64bit __get_user_asm_* implementation.

Until that implementation is done, remove the choice for
32bit ARM, automatically enabling the old 32bit binder
protocol.

This can be reverted once a 64bit __get_user_asm_*
implementation is merged.

Cc: Colin Cross <ccross@android.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Serban Constantinescu <serban.constantinescu@arm.com>
Cc: Android Kernel Team <kernel-team@android.com>
Reported-by: NArnd Bergmann <arnd.bergmann@linaro.org>
Signed-off-by: NJohn Stultz <john.stultz@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/Kconfig

@@ -21,7 +21,7 @@ config ANDROID_BINDER_IPC
 	  between said processes.
 
 config ANDROID_BINDER_IPC_32BIT
-	bool "Use old (Android 4.4 and earlier) 32-bit binder API"
+	bool
 	depends on !64BIT && ANDROID_BINDER_IPC
 	default y
 	---help---