Add OEM specific USB mode enumeration based on ro.bootmode property

This patch is adding a capability so that OEM can override USB mode
in case the device is boot up with OEM specific mode. (i.e. modem
debug, factory test etc.)

Bug:5964042
Change-Id: Ic8e23d302563ce71eedb74ce94cca8c65838a4f7
2 files changed