ANDROID: GKI: preserve CRC generation for some bluetooth symbols

In commit a2d816f5 ("Bluetooth: hci_bcm: Fall back to getting bdaddr
from EFI if not set"), a "#include <linux/efi.h>" was added which caused
the CRC generation of some bluetooth symbols to be modified due to some
structures now coming into "scope".

Fix this up by hacking in our favorite __GENKSYMS__ test, which fixes
everything up right and all is calm again.

Bug: 161946584
Fixes: a2d816f5 ("Bluetooth: hci_bcm: Fall back to getting bdaddr from EFI if not set")
Change-Id: I5ddb1d3895f079980c3efd64ae773b91da3ca809
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>