defconfig: msmkrypton: enable qpnp-regulator and stub regulator

Enable CONFIG_REGULATOR, CONFIG_REGULATOR_QPNP, and
CONFIG_REGULATOR_STUB in order to provide support for regulator
devices.

Change-Id: Ie543180c45d80db45bcc27a2fb3357dca6937b8a
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>