ANDROID: GKI: CONFIG_FORTIFY is broken in clang, so it has been disabled

Commit a52f8a59 ("fortify: Explicitly disable Clang support")
dropped fortify support for clang compilers until the compiler is fixed
up.  This requires us to also drop it from the gki configurations as it
is not able to be selected anymore.

Fixes: a52f8a59 ("fortify: Explicitly disable Clang support")
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Iad106506847e3f88c1129e8c61f58f68412f7cae