input: bu21149: add pinctrl and regulator support

The bu21150 touch AFE driver does not have pinctrl and regulator to
access GPIOs and do power management. Therefore, add such change to
keep the feasibility.

Change-Id: Iab145096162e83d51aef75f61f3364a0298a3b47
Signed-off-by: Chun Zhang <chunz@codeaurora.org>