gpio: qpnp-pin: Update MPP and GPIO subtypes based on doc change

The subtypes defined in the documentation have changed again.
Update both GPIO and MPP subtype values in the qpnp-pin driver to
reflect this.

Change-Id: I22e22414a74d724259706c927582d1573dc58875
Signed-off-by: Michael Bohan <mbohan@codeaurora.org>