ANDROID: ABI: add another missing symbol to the fips140 symbol list

For some reason rng_is_initialized was left off from commit 0ca9901b
("ANDROID: ABI: add missing symbols to fips140 symbol list") which
breaks the fips140 build.  Fix that up by adding it to the list.

Bug: 188620248
Cc: Eric Biggers <ebiggers@google.com>
Fixes: 0ca9901b ("ANDROID: ABI: add missing symbols to fips140 symbol list")
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: If778fb9a46a23a68d2c6206680b670d0ea58c6af