amenia: enable 1 slot of secure temporary storage
amenia: enable 1 slot of secure temporary storage

BUG=none
BRANCH=none
Test=amenia is able to resume from S3

Change-Id: Idd89c791b65b67051a433d02ffb0fb1df1b834ef
Signed-off-by: Kevin K Wong <8bf1d1ccd36a6bfde85ceaaa1fe52f2093ecf3aa@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/358630
Reviewed-by: David Hendricks <3b0deacc4b5357f519084f1ea34bd42bf5d34545@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec