ANDROID: GKI: Update abi_gki_aarch64_qcom list for shmem allocations

Add support for shmem allocations in kernel. Update allowed list with symbols
for the feature implementation.

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 struct file* shmem_file_setup(const char*,
					loff_t, unsigned long)

  [A] 'function struct page* shmem_read_mapping_page_gfp(
					struct address_space*, pgoff_t, gfp_t)

Bug: 191813051
Change-Id: I4ca5f36cfac146695b64739b426df71834789d9f
Signed-off-by: Rohan Sethi <rohsethi@codeaurora.org>