scripts: config_whitelist: Handle lines with leading spaces/tabs

Some Kconfig options are defined in a line with leading spaces/tabs.
Update build-whitelist/check-config scripts to handle such cases.
Generate a new config_whitelist.txt with new scripts.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/scripts/build-whitelist.sh b/scripts/build-whitelist.sh
index f169eaa..7d8160d 100755
--- a/scripts/build-whitelist.sh
+++ b/scripts/build-whitelist.sh
@@ -39,8 +39,8 @@
 # Finally, we need a list of the valid Kconfig options to exclude these from
 # the whitelist.
 cat `find . -name "Kconfig*"` |sed -n \
-	-e 's/^config *\([A-Za-z0-9_]*\).*$/CONFIG_\1/p' \
-	-e 's/^menuconfig *\([A-Za-z0-9_]*\).*$/CONFIG_\1/p' \
+	-e 's/^\s*config *\([A-Za-z0-9_]*\).*$/CONFIG_\1/p' \
+	-e 's/^\s*menuconfig *\([A-Za-z0-9_]*\).*$/CONFIG_\1/p' \
 	|sort |uniq >scripts/config_whitelist.txt.tmp2
 
 # Use only the options that are present in the first file but not the second.