nimble/phy: Fix CRC poly configuration
nimble/phy: Fix CRC poly configuration

It works now probably because 8 MSb in CRCPOLY registers are unused
in nRF52 (for now).

X-Original-Commit: aa387adda43fccdf0eb141b7ee2f5985624d0670

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