ion: Don't allow building ION as a module.

ION doesn't export the proper symbols for it to be a module. This
causes build issues when ION is configured as a module.

Since Andorid kernels rarely use modules (I think recent policy
requires no modules?), go ahead and set the ION config to a bool
from the tristate option.

If folks decide ION as a module is important, we will have to go
through and export the various needed symbols.

Signed-off-by: John Stultz <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/android/ion/Kconfig

···
 menuconfig ION
-	tristate "Ion Memory Manager"
+	bool "Ion Memory Manager"
 	select GENERIC_ALLOCATOR
 	select DMA_SHARED_BUFFER
 	---help---