Add support for system suspend/resume PM hooks, save the
register context of all the required gpio registers on suspend
and restore context on the resume.
Signed-off-by: NDevarsh Thakkar <devarsht@ti.com>
Signed-off-by: NAswath Govindraju <a-govindraju@ti.com>
Signed-off-by: NBartosz Golaszewski <brgl@bgdev.pl>