ANDROID: GKI: Remove PINCTRL_MSM as built in driver

PINCTRL_MSM driver can be enabled as module, so remove
PINCTRL_MSM from hidden configs.

Bug: 158125476
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I11c5f0265e0068a0d21711344b9a44e1b41266e1