power: supply: hl6111r: Initial commit of driver

HL6111R is a wireless charging power receiver IC that has a maximum
power output of 15 W, a maximum current output of 2.2 A, and a
programmable output voltage range of 4 V to 20 V with different step
sizes. It supports both the A4WP and WPC wireless charging standards.

This driver supports only the WPC mode of the IC.

Change-Id: I64bdd95fe222dfff206dfb58d11d631233ccee58
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>