hikey: Fix fstab.hikey-3.18 to not mount cache partition

This was missed in a previous commit removing the cache parition
which is needed to support GSI

Change-Id: I4e052b33ddd5d0d1924dbad2c67a3664b57777b6
Signed-off-by: John Stultz <john.stultz@linaro.org>
1 file changed