defconfig: arm64: msm: enable NCP6335D and FAN53555 regulator drivers

MSM8939 uses external I2C controlled buck regulator to supply APC power
rail. Enable Onsemi NCP6335D and Fairchild FAN53555 regulator drivers to
support both on MSM8939 boards.

Change-Id: Ib3fef799c0ceb6821e442a652522952f87fcab90
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>