Makefile: delete unused lines

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/Makefile b/Makefile
index e28878b..5ad2bd7 100644
--- a/Makefile
+++ b/Makefile
@@ -784,12 +784,6 @@
 $(obj).boards.depend:	boards.cfg
 	@awk '(NF && $$1 !~ /^#/) { print $$7 ": " $$7 "_config; $$(MAKE)" }' $< > $@
 
-#
-# Functions to generate common board directory names
-#
-lcname	= $(shell echo $(1) | sed -e 's/\(.*\)_config/\L\1/')
-ucname	= $(shell echo $(1) | sed -e 's/\(.*\)_config/\U\1/')
-
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