power: qpnp-smbcharger: only execute UVLO workaround on 1.x chips

The UVLO fix is not needed on 2.x PMICs because the hardware bug has
been fixed. Disable the workaround if the charger revision is > 1.x.

Change-Id: I628fc5da79c95507d658950d275e6991b9979d85
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>