CHROMIUM: ARM64: add gpio.h to increase default nr

Signed-off-by: Olof Johansson <olofj@chromium.org>
Signed-off-by: David Riley <davidriley@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/206724
Git-commit: a98a5186344c027fb53506994ce93f7af8a79960
Git-repo: https://chromium.googlesource.com/chromiumos/third_party/kernel


[joonwoop@codeaurora.org: fixed merge conflict in arch/arm64/Kconfig.
 removed Change-Id tag from commit text.]
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>