ANDROID: GKI: add allowed list for Exynosauto SoC

This patch adds GKI symbol list for Exynosauto SoC. We need to add
below 3 function symbols and it required by VLX driver.

3 function symbol(s) added
  'struct work_struct* current_work()'
  'int sigprocmask(int, sigset_t*, sigset_t*)'
  'struct thermal_zone_device* thermal_of_zone_register(struct device_node*, int, void*, const struct thermal_zone_device_ops*)'

Bug: 310831391
Change-Id: Ibc0405f9e72eb1cc11095eab715130f4ec1ec0ee
Signed-off-by: Hang Wei <hang01.wei@samsung.com>