input: pmic8058-othc: Add support for PMIC8058 OTHC

The driver interfaces the OTHC (one-touch headset controller)
module (of PMIC8058) with the input subsystem. It supports
headset insert, remove and switch press, release operations.

It supports both NO (normally open) and NC (normally closed)
types of headset.

CRs-Fixed: 211767
Change-Id: Id32cd32a59e058112d39db53fc666181ea2b6eeb
Signed-off-by: Anirudh Ghayal <aghayal@qualcomm.com>