GH-14: build: Test all by default

This might be enabled only if needed (eg: rebase branch)

Bug-SiliconLabs: UIC-3082
Bug-GitHub: #3
Origin: #6
Forwarded: https://github.com/SiliconLabs/UnifySDK/pulls/rzr
Signed-off-by: Philippe Coval <philippe.coval@silabs.com>

Author: rzr

helper.mk

@@ -3,7 +3,7 @@
 # ex: set tabstop=4 noexpandtab:
 # -*- coding: utf-8 -*
 
-default: help zpc/default
+default: help all/default
 	@echo "$@: TODO: Support more than $^ by default"
 	@date -u