Add EON25S64 SPI flash device

BUG=chrome-os-partner:25907
BRANCH=baytrail(rambi)
TEST=read and write BIOS on glimmer with Eon device.

Change-Id: Id36dbeee70279414983c0ae6723a74d553366703
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-on: https://chromium-review.googlesource.com/197793
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
3 files changed