nimble/ll_dtm: Fix for enabling clock on RX
nimble/ll_dtm: Fix for enabling clock on RX

X-Original-Commit: 75863a690278e8b64f4a947dc0daf0f192ebc838

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