ANDROID: update abi_gki_aarch64.xml for ion, drm changes

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 drm_mode_convert_umode(drm_device*, drm_display_mode*, const drm_mode_modeinfo*)'
  [A] 'function void ion_buffer_prep_noncached(ion_buffer*)'

Bug: 139653858
Change-Id: I94e105aab84fdfd632e06d79b9aa42c32c38aaa3
Signed-off-by: Alistair Delva <adelva@google.com>