driver: pinctrl: Add reserved GPIOs for Holi

Certain GPIOs are reserved for secure world and cannot be accessed by HLOS.
Supply "reserved_gpios" to msm_pinctrl to mark these pins as invalid.

Change-Id: I07807f37adfd6d90e7b1bdc72b2106520f378b02
Signed-off-by: Mayank Grover <groverm@codeaurora.org>