Get function declaration from fb_gm20b.h. This solves
Sparse warnings due to the missing of function prototype.
bug 200299572
Change-Id: Ie692f88e5bfc771bfcbb713adda3776521788f8c
Signed-off-by: Bo Yan <byan@nvidia.com>
Reviewed-on: http://git-master/r/1468858
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>