msm: board-8064: Add initial PMIC GPIO configuration

Various tech teams require PMIC gpios to be configured
in order to use them. Add the required default
configuration.

Also, wrap PMIC 8921 MPP 8 in a gpio-regulator device
so that the USB4 driver can be simplified.
MPP 8 represents the GOBI_3.3_PWR_EN signal on 8064
Liquid devices, and HAPTIC_PWR_EN on MTP devices.

While at it, update MPP7 type according the Avenger GPIO
config specification.

Change-Id: Ib09ef9e65bb1b5ce967ba4f8863f4f090873126a
Signed-off-by: Jay Chokshi <jchokshi@codeaurora.org>