Multihal 2.0 - Small tweaks to sensorHandle handling

Add the sensor handle to subhal index bitmask as a constant. Change the
name of zeroOutFirstByte method to clearSubHalIndex and use the constant
there. Also use the constant in initSensorsList method.

Bug: 136511617
Test: Tested compilation success.
Change-Id: I3983850827697ff77c484e7b8d33e7722a7fb52a
2 files changed