pinctrl: qcom: Save and restore TLMM registers

Save and restore TLMM registers to make hibernation work.
Uses power management notifiers for differentiating between
suspend to RAM and suspend to disk(hibernation) operations during
system suspend and restore.

Change-Id: I4042054fc04e17da07eaab3dc36dbac58d1a1b24
Signed-off-by: Ankur Saxena <ankusa@codeaurora.org>
Signed-off-by: Arun KS <arunks@codeaurora.org>