Fuzzer for g722 encoder

Max-length of Input provided to fuzzer is 4096. Ideally it would be less
than that in the encoder call.

To Build the fuzzer:
SANITIZE_TARGET=hwaddress m g722_enc_fuzzer

To run(on device):
adb shell data/fuzz/arm64/g722_enc_fuzzer/g722_enc_fuzzer

Bug: 164457579
Tag: #security
Test: Tested on pixel 4 with no initial corpus and getting ~6000 exec/s
Change-Id: I8392e2d3b432f213402789fd6af60901b1df8bdc