power: supply: bq24190_charger: add support for bq24192 variant

This patch adds support for the bq24192 variant to bq24190_charger.

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
[masneyb@onstation.org: Changed if statement to a switch based on
feedback from Sebastian Reichel.]
Signed-off-by: Brian Masney <masneyb@onstation.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>