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>
diff --git a/src/mainboard/google/nyan/Kconfig b/src/mainboard/google/nyan/Kconfig
index 8ffd1a5..3c8bc83 100644
--- a/src/mainboard/google/nyan/Kconfig
+++ b/src/mainboard/google/nyan/Kconfig
@@ -28,6 +28,8 @@
 	select SOC_NVIDIA_TEGRA124
 	select MAINBOARD_HAS_BOOTBLOCK_INIT
 	select MAINBOARD_DO_NATIVE_VGA_INIT
+	select SPI_FLASH
+	select SPI_FLASH_FAST_READ_DUAL_OUTPUT_3B
 
 
 config MAINBOARD_DIR