mainboard/avalue: Use C89 comments style & remove commented code

Change-Id: I416d3c212653260a28cb07ed86fda34b736ba4ca
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/16926
Tested-by: build bot (Jenkins)
Reviewed-by: Kerry Sheh <shekairui@gmail.com>
3 files changed