Remove unneeded CONFIG_SHELL references

Make should be using the bash shell by default which makes
CONFIG_SHELL unnecessary

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/Makefile b/Makefile
index 913fd16..4dafd2b 100644
--- a/Makefile
+++ b/Makefile
@@ -374,8 +374,7 @@
 
 $(VERSION_FILE):
 		@( printf '#define U_BOOT_VERSION "U-Boot %s%s"\n' "$(U_BOOT_VERSION)" \
-		 '$(shell $(CONFIG_SHELL) $(TOPDIR)/tools/setlocalversion $(TOPDIR))' \
-		 ) > $@.tmp
+		 '$(shell $(TOPDIR)/tools/setlocalversion $(TOPDIR))' ) > $@.tmp
 		@cmp -s $@ $@.tmp && rm -f $@.tmp || mv -f $@.tmp $@
 
 $(TIMESTAMP_FILE):