ANDROID: GKI: Add symbol list for exynosauto

These symbols are required to use custom driver
for writing data into Serial device
using common TTY drivers for basic data trasmit via UART/SPI.

INFO: 2 function symbol(s) added
  'int serdev_device_write(struct serdev_device*, const unsigned char*, size_t, long)'
  'void serdev_device_write_wakeup(struct serdev_device*)'

Bug: 356635235
Change-Id: Ia365485ad4b533e5e2826add9182bc98b5563f81
Signed-off-by: iabdullah <imrankhan.abdullah@harman.com>