Add PSU callback to nyan platforms

This change adds PSU callback to nyan platforms to return correct
psu types.
 - big: battery
 - blaze: battery
 - kitty: AC_only

TEST=tested on big, blaze and kitty. got the correct psu type by
"mosys psu type".

Change-Id: I057a08b7517fa2c00fd2886fe5eb9453b5962c9e
Tested-by: Ken Chang <>
Tested-by: Titan Lee <>
Reviewed-by: Shawn Nematbakhsh <>
Reviewed-by: David Hendricks <>
Commit-Queue: Ken Chang <>
4 files changed