Adds additional sanitization for Zygote command arguments.

Previously we were only insuring that the arguments provided to the
Zygote didn't contain any newlines.  This adds additional checks for
carriage returns and standalone integer arguments to protect against
malicious argument and packet injection respectively.

Bug: 130164289
Test: m & flash & boot & check logs
Change-Id: I4055c50d52db0047c02c11096710fd07b429660c
Merged-In: I4055c50d52db0047c02c11096710fd07b429660c
(cherry picked from commit c9919824)