phy: fix cca ed level parameter parsing
phy: fix cca ed level parameter parsing

This patch fix the parsing of cca ed level parameter which is now an
floating point dbm value.

Signed-off-by: Alexander Aring <d03dbcdedb9639e397df9b8578e8fc8274f4e6c4@gmail.com>
Reviewed-by: Varka Bhadram <d87a866b66cf1f04eab09125e0275d379e3910c1@gmail.com>

cfriedt/wpan-tools,cfriedt/wpan-tools