defconfig: sdxlemur: Enable QTI regulator debugfs features

Enable CONFIG_REGULATOR_QTI_DEBUG so that regulators can be
controlled from debugfs for testing purposes.

Change-Id: I9cd64973f2c1031c8cdd8fde569d21d24189da66
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>