ANDROID: GKI: Add symbols to symbol list

Add walk_page_range() and swp_swap_info() to symbol list.

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 swap_info_struct* swp_swap_info(swp_entry_t)'
  [A] 'function int walk_page_range(mm_struct*, unsigned long int, unsigned long int, const mm_walk_ops*, void*)'

Bug: 225273514
Signed-off-by: Liujie Xie <xieliujie@oppo.com>
Change-Id: Ia3e8ba0d0a8fe4ed3953af9baf9028d5f27e76e2