Add ubus call to set/get LIBWIFI_DEBUG_LEVEL
LIBWIFI_DEBUG_LEVEL env variable has been created to handle set/get debug level for easy_soc_libs debugging.
Usage: ubus call wifi debug_level -> prints current LIBWIFI_DEBUG_LEVEL value ubus call wifi debug_level '{"debug_level":X}' -> set the new LIBWIFI_DEBUG_LEVEL value as X.
In easy_soc_libs debug_level is implemented with the following values (the same as the linux kernel's log level): ERR = 3 WARN = 4 INFO = 6 DBG = 7
@janusz @Marek @bartlomiej.grzeskowiak Please review
Signed-off-by: Grzegorz Sluja grzegorz.sluja@iopsys.eu