misc: nct1008: Add new suspend mode for Tegra LP1

misc: nct1008: Add new suspend mode for Tegra LP1

For Tegra devices, it is desirable to keep the NCT1008/72
device awake during some suspend states.

Add new "suspend mode" to support this feature, if
CONFIG_TEGRA_LP1_LOW_COREVOLTAGE is set. Required
parameters are passed in through board file data.

Bug 1261915

Change-Id: Ibae7e6a661d817c0cc514373b934665d68d063b7
Signed-off-by: Daniel Solomon <daniels@nvidia.com>
Reviewed-on: http://git-master/r/216368
(Cherry picked from e02beb3f82f4164c834797a1855e716645abaf7a)
Reviewed-on: http://git-master/r/226484
Reviewed-by: Karthik Ramakrishnan <karthikr@nvidia.com>
Tested-by: Karthik Ramakrishnan <karthikr@nvidia.com>
Reviewed-by: Diwakar Tundlam <dtundlam@nvidia.com>
GVS: Gerrit_Virtual_Submit