ARM: dts: apq: Add USB OTG support for APQ8096 Auto DragonBoard

USB OTG mode depends on USB ID detection performed by the PMIC driver.
APQ8096 DragonBoard SOMs use either a PMI8994 or a PMI8996 component.
In PMI8994, USB ID detection is based on an interrupt handled by the
qpnp-smbcharger driver, so the pmi8994_charger device tree node
must be enabled.

In PMI8996, pmi8994_fg device needs to be enabled as well, as the charger
USB ID detection is not connected to any interrupt, but handled by the
qpnp-fg driver.

Change-Id: I1ff5855125587c069ae4cbf223ff2e4668363e60
Signed-off-by: Ajit Khare <ajitk@codeaurora.org>