Discard cur conn-update upon rx of conn-param-req.
Discard cur conn-update upon rx of conn-param-req.

X-Original-Commit: a5cebefcf67a595a7067548497f8f82295c00ec6

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