ANDROID: GKI: remove CONFIG_RCU_FAST_NO_HZ from gki_defconfig

CONFIG_RCU_FAST_NO_HZ is no longer a config option, so remove it from
the gki_defconfig files so that the build will work again.

Fixes: e2c73a68 ("rcu: Remove the RCU_FAST_NO_HZ Kconfig option")
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I980087ec0712fd3fc5843f227e5b88c9a87d5fa1