net: rmnet_data: Enhance logging macros to remove duplicated code

Logging macros now enforce that function names are printed, and
newlines are inserted at the end. The start of log messages are
now standardize.

CRs-Fixed: 600629
Change-Id: I91dae00c331af80954b93eba1f7be2889c569276
Signed-off-by: Harout Hedeshian <harouth@codeaurora.org>