liblog: Move log messages from Diag_Lib to radio log

 * This is incredibly spammy and QC specifc. Move to radio log.

Change-Id: I775ea9d0fbe1b7d32da3f0e8faef28149f0001ac
libnetutils: add ifc_set_mtu

Change-Id: I3031e9ee38583648350f2c46baa7a9a714b9ea1e