ANDROID: GKI: Update ABI for zsmalloc fixes

zs_pool->lock was added upstream as a replacement for the size_class
locks.

The tooling over-cautiously reports this as a ABI breakage but both
of these structs (zs_pool and size_class) are internal to zsmalloc.c.

Update the ABI to allow these changes.

Bug: 297093100
Change-Id: Ib9fc5a036f75d89fb6bee4c146034f6c81759e04
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>