nimble/phy: Remove redundant code
nimble/phy: Remove redundant code

Packet pointer was probably increment to have payload word-aligned, but
this does not seem to have any effect here as we do not have optimized
memcpy for such case. Also, since there is no explicit call to memcpy
GCC will also not be able to emit built-in optimized memcpy here (e.g.
when doing os_membuf_copydata).

X-Original-Commit: 282789d30457eb2500f0dfb1311a222274969fd1

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