power: smb135x-charger: Add a debugfs node to force-recharge

Restarts the charging if has been held-off due to charge-inhibit or
recharge threshold.

To resume charging when charger is in inhibit, disable and re-enable
inhibit with appropriate delays. To resume charging when the battery
is above the recharge threshold, disable and re-enable charging with
inhibit disabled.

Change-Id: I464c1cc66a96060131ac6361bcac135982214ff2
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>