ANDROID: ABI: add allowed GKI symbol for Exynosauto SoC

This patch adds below two symbols to GKI allowed symbol list.

- pcie_get_mps: get PCI Express maximum payload size for PCIe EP and RC
- platform_find_device_by_driver: To find a platform device which are
matched with exynos DRM driver

Leaf changes summary: 2 artifacts changed
Changed leaf types summary: 0 leaf type changed
Removed/Changed/Added functions summary: 0 Removed, 0 Changed, 2 Added functions
Removed/Changed/Added variables summary: 0 Removed, 0 Changed, 0 Added variable

2 Added functions:

  [A] 'function int pcie_get_mps(pci_dev*)'
  [A] 'function device* platform_find_device_by_driver(device*, const device_driver*)'

Bug: 176138611
Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Change-Id: Ib06675b7431f247071f873fa8e44a7e5b90e764a