moving log.c and log.h to lib/

removing lib/driver_utils.h as it have no purpose anymore now

fusee/fusee-secondary/src/sdmmc/sdmmc.c

@@ -26,7 +26,6 @@
 #include "mmc.h"
 #include "sd.h"
 #include "../timers.h"
-#include "../lib/driver_utils.h"
 
 #define UNSTUFF_BITS(resp,start,size)                               \
 ({                                                                  \

fusee/fusee-secondary/src/sdmmc/sdmmc_core.c

@@ -30,8 +30,7 @@
 #include "../gpio.h"
 #include "../pmc.h"
 #include "../max7762x.h"
-#include "../lib/driver_utils.h"
-#include "../log.h"
+#include "../lib/log.h"
 
 static SdmmcLogLevel g_sdmmc_log_level = SDMMC_LOG_NONE;