ANDROID: GKI update xiaomi symbols list

ABI DIFFERENCES HAVE BEEN DETECTED!

2 Added functions:

  [A] 'function int mmc_set_blocklen(mmc_card*, unsigned int)'
  [A] 'function unsigned long int nr_free_buffer_pages()'

Bug: 299962441
Bug: 300381609
Bug: 302865694
Change-Id: Ic63dc8380ad39ba789efee8e7de63c56db66a085
Signed-off-by: p-liuqi1 <liuqi20328@gmail.com>
(cherry picked from commit 88525fa7)