ARM: dts: am335x-chiliboard: Support charger

chiliBoard has a battery connector, so support charging battery
through tps65217 chip.

Additionally, enabling tps65217 charger allows us to get status
of AC power.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>