[CDM] Fixed an issue where SecureChannel would erroneously close upon...

[CDM] Fixed an issue where SecureChannel would erroneously close upon receiving a bad message rather than ignoring it. 

By design, the secure channel should not consider a badly formatted message _after_ a successful connection to be a fatal error. An unhandled exception type (CryptoException caused by an attempt to decrypt a rogue message) was causing the secure channel to behave otherwise.

Bug: 443136060
Test: m services.companion
Flag: EXEMPT bug fix
Change-Id: I11926f274dd36a54893e12a07777cde4d3e04452