nyan: turn on dual-output reads for SPI flash

Nyan's SPI chip is capable of dual-output reads, so let's use it.

BUG=none
BRANCH=none
TEST=built and booted on nyan
Signed-off-by: David Hendricks <dhendrix@chromium.org>

Change-Id: I51a97c05aa25442d8ddcc4e3e35a2507d91a64df
Reviewed-on: https://chromium-review.googlesource.com/177836
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Commit-Queue: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>
1 file changed