common: Fix a typo abnove -> above

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
diff --git a/common/Kconfig b/common/Kconfig
index c759952..af66496 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -560,7 +560,7 @@
 	help
 	  This is the default logging level set when U-Boot starts. It can
 	  be adjusted later using the 'log level' command. Note that setting
-	  this to a value abnove LOG_MAX_LEVEL will be ineffective, since the
+	  this to a value above LOG_MAX_LEVEL will be ineffective, since the
 	  higher levels are not compiled in to U-Boot.
 
 	    0 - emergency