ANDROID: GKI: update symbol list for MTK

1 function symbol(s) added
  'unsigned long vm_unmapped_area(struct vm_unmapped_area_info*)'

Bug: 375352467
Bug: 388157331
Signed-off-by: Bosser Ye <bo.ye@mediatek.com>
Signed-off-by: GW Chen <gw.chen@mediatek.com>
Signed-off-by: Vincent Sung <vincent.sung@mediatek.com>
Change-Id: I50ce4beb861d55defaa61857db40f8ecb0cb82b2
(cherry picked from commit 62a6e357)