power: supply: qti-battery-charger: Initialize pmic_glink_client_data

Fix pmic_glink_client_data initialization without which ssr_cb
that would be added in the upcoming patch causes an incorrect
list addition to PMIC Glink notification list.

Change-Id: I7588ae894e8188c30456f4c16711bc6b757a9863
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>