Fix interger overflow when parsing avrc response

Convert min_len from 16 bits to 32 bits to avoid
length checking overflow.
Also, use calloc instead of malloc for list allocation
since caller need to clean up string memory in the list items

Bug: 242459126
Test: fuzz_avrc
Tag: #security
Ignore-AOSP-First: Security
Change-Id: I7250509f2b320774926a8b24fd28828c5217d8a4