msm: board-8960: Add external 3.3 V regulator for 8960 LiQUID

Add a GPIO controlled regulator device to manage the external
3.3 V buck-boost regulator on 8960 LiQUID via PMIC PM8018
GPIO 17.  This regulator is shared between several consumers.

Signed-off-by: David Collins <collinsd@codeaurora.org>
3 files changed