ANDROID: GKI: Fix CRC issue for drm functions

In commit a508a102 ("drm/shmem-helper: Fix BUG_ON() on
mmap(PROT_WRITE, MAP_PRIVATE)"), a new .h file is added which breaks the
CRC generation for a bunch of drm functions.  Fix thi up by providing
the needed __GENKSYMS__ hack to prevent this.

Fixes: a508a102 ("drm/shmem-helper: Fix BUG_ON() on mmap(PROT_WRITE, MAP_PRIVATE)")
Change-Id: Id05faf8b5598972cd41ca32485b0e4fac21b79bb
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>