ANDROID: GKI: remove squashfs-needed symbols from exported abi

squashfs is not recommended to be used by anyone anymore, so remove the
exported symbols that is needed by that.  Anyone using this filesystem
is on their own...

Bug: 157965270
Cc: zhaoyouyi <zhaoyouyi@allwinnertech.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Id015f68e379d4d998e1d12e25878068624292000