ANDROID: Add initial symbol list for Exynos SoC

This commit is for adding initial symbol list form Exynos SoC.
"abi_gki_aarch64_exynos" is generated from minimal configs for build.

2 function symbol(s) added
  'int devm_hwrng_register(struct device*, struct hwrng*)'
  'int irq_force_affinity(unsigned int, const struct cpumask*)'

Bug: 278466304
Change-Id: I6a700eda5639bf46f694524fefe91b759583704d
Signed-off-by: Junki Min <joonki.min@samsung.com>