ARM: dts: msm: Update the PM660 GPIO definitions

Update the PM660 GPIOs definitions to use the spmi-gpio
driver instead of qpnp-pin.

Change-Id: Id523d29ef64b9fad00eca1a53c0b3d041328d092
Signed-off-by: Asha Magadi Venkateshamurthy <amagad@codeaurora.org>