staging: android: binder: move debugging mask into a macro

I moved the continual,

if (binder_debug_mask & mask)
	printk()

into a single macro so it's all in one place. It could be refined further
from there.
Signed-off-by: Daniel Walker <dwalker@fifo99.com>
Cc: Brian Swetland <swetland@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>