scarlet: support rearrangement of warm_reset

Newer servo headers may have warm_reset on pin 39,
add a config based on board selection to configure
yoshi header in the new way or old way.

TEST=Works on scarlet, works on reef config.

Change-Id: I399ecdda8f77578c415aa021d9d8af23876c4b37
Signed-off-by: Nick Sanders <>
Reviewed-by: Alexandru M Stan <>
11 files changed