power: qpnp-smb5: Modify the usage of INPUT_CURRENT_LIMIT in batt_psy

Use the property INPUT_CURRENT_LIMIT to suspend and un-suspend
USB and DC paths.

Change-Id: Id0636e7c792c63156597d5db4e9087bd5fdc262f
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>