gpio: sx150x: Add VDD regulator voting support

Add VDD regulator voting which is required for io-expander.
In absence of same io-expander pulls down i2c lines resulting
in i2c communication with other slaves to fail as well.

CRs-Fixed: 2053404
Change-Id: I28cc02b87f8a790733ccdc85a95823fe35266519
Signed-off-by: Arumuga Durai A <cadurai@codeaurora.org>