host/l2cap_sig: MPS on any channel cannot be decreased
host/l2cap_sig: MPS on any channel cannot be decreased

If reconfiguration request contains >1 CID and MPS value is reduced for
only one of them this request should still fail.

This is affecting L2CAP/ECFC/BI-04-C

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble