power: qpnp-linear-charger: Fix the TCHG_MAX configuration

Fix the TCHG max enable configuration to set the correct bit.
Also, update the TCHG_MAX time to 232 minutes to support a
500mA charger.

Change-Id: I3f7db361a7d648cc1b87900c822128a28825ee00
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>