nimble/test: Limit max characteristics when validating handling FIX
nimble/test: Limit max characteristics when validating handling FIX

X-Original-Commit: aeee05761453b36f81426ce95de1e4c6ce70697d

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