Memtest86Plus/Makefile: Update to common payload makefile format

This series of patches attempts to update all of the external payload
makefiles to be as similar as possible.

- Add .git to the git repo URL to show that it's a git repo.
- Use the common checkout, fetch, and clone ($(project dir)) targets
- Add TAG-y and NAME-y variables - just with origin/master for now.
Stable will be added shortly.
- Make sure all phony targets are in .PHONY

Change-Id: If83c100841d5f91a9fab7ac44ba20ec2271c0594
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/14152
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

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