sys_log: replace old debug macros at USB DFU sample

USB DFU sample application is now using new system log macros and
updated the .conf file.

JIRA: ZEP-311

Change-Id: Ifa5ede70c06a5fe18dde865fa7e97f469364ddb8
Signed-off-by: Genaro Saucedo Tejada <genaro.saucedo.tejada@intel.com>
2 files changed