net: pkt: Print debug prints in one line

In earlier commit 15e7e3ea ("net: ip: Split debug prints into
smaller pieces"), the net_pkt debug prints were split to two
lines because of the argument count limitation in logging system.
As the logging subsystem increased the limit count in
commit 62d01154 ("logging: Support for up to 15 arguments in log
message") we can restore the original version as it is easier
to read.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>