defconfig: lahaina-gki: enable the qcom_pm8008-regulator driver

Enable the PM8008 regulator driver so that the camera driver can
configure the camera supply regulators found in the pair of PM8008
PMIC chips on Lahaina boards.

Change-Id: Ic07f38865579c5b74ea1c58bc5206194eb3b979f
Signed-off-by: David Collins <collinsd@codeaurora.org>