defconfig: sdxlemur: Enable RPMh and GPIO regulators

Enable CONFIG_REGULATOR_RPMH and CONFIG_REGULATOR_GPIO so that regulator
devices using these drivers may be bound to them and used.

Change-Id: I7c5f7c9b24982d08dc5c25e47d09bfe3312cc3e2
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>