soc: qcom: add initial version of qti_battery_debug driver

QTI battery debug driver helps to get logs and debug information
by communicating with charger firmware (CHGFW) running on the
remote subsystem (e.g. DSP) over PMIC Glink. Currently, it
supports getting the device context dump of battery gauging
software which is part of CHGFW.

Change-Id: I7bb303cf61a97f3087f8c024fc6b37e68e5d1f1e
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>