include: print_log: use default LOG_LEVEL

Set default log level to LOG_INFO inside `print_log.h`.

Remove the log level defines from projects where the default one is
used.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>

Compatible with ad_fmcomms1_ver_1__2013_08_23 hdl.

Compatible with ad_fmcomms1_ebz_edk_14_4_2013_04_04 hdl.

Compatible with ad_fmcomms1_ebz_edk_14_4_2013_04_04 hdl.

Compatible with ad_fmcomms1_ebz_edk_14_4_2013_03_20 hdl.