ANDROID: GKI: power: power_supply: Add property CHARGE_COUNTER_EXT and 64-bit precision properties

Add POWER_SUPPLY_PROP_CHARGE_COUNTER_EXT that stores accumulated charge
in nAh units as a signed 64-bit value.

Add generic support for signed 64-bit property values.

Signed-off-by: Todd Poynor <toddpoynor@google.com>
(cherry picked from commit 6a427739547b457e28fd46f882ea9ba22e6b7920)
Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 150789066
Change-Id: I2bd34b1e95ffba24e7bfef81f398f22bd2aaf05e