arm: tegra: add tegra pm notifier

Add PM notifier to suspend/resume device for LP0 in idle.

Bug 1254633

Change-Id: I4b6e7e1a00202ab6a4fe6eb12110b82b92589766
Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com>
Reviewed-on: http://git-master/r/309617
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>

Conflicts:
	arch/arm/mach-tegra/pm.c