qcom-charger: expose RRADC charger temp and usbin readings

Read the charger die temperature and its threshold from RR_ADC,
and expose to the userspace through battery PSY.

Read USBIN current and voltage from RR_ADC, and expose to the
userspace through USB PSY.

CRs-Fixed: 1050042
Change-Id: I452a050298a6ab081f64aa2dcf295d2d257bcb32
Signed-off-by: Harry Yang <harryy@codeaurora.org>