max1720x_battery: seperate serial_number read path

P7 flip side battery sn read from gauge register
P7 base side battery sn read from eeprom

Bug: 181624931
Signed-off-by: Jenny Ho <[email protected]>
Change-Id: Ibd6d369cc49fd2ad67de6e8c702a57072d2031a3
1 file changed