msm: pci: Configure clkreq gpio wakeup capability at runtime

By default pinctrl driver is disabling wakeup capability for gpios
for which interrupt is not registered. This could cause wakeup from
L1SS sleep not working. Hence fix it by enabling/disabling wakeup
capability for clkreq gpio as part of DRV suspend/resume handling.

Change-Id: If8fcb0a3a638c560bfe1f614aa00b7fd872c6b98
Signed-off-by: Vivek Pernamitta <vpernami@codeaurora.org>
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>