libpayload:  make wifi calibration table available through sysinfo

The WiFi calibration blob saved in the CBMEM by coreboot needs to be
visible by depthcharge to supply it to the kernel.

BRANCH=storm
BUG=chrome-os-partner:32611
TEST=none yet

Change-Id: Iecd8739c9269b58064b3c3275f5376cebcd6804b
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/225506
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
3 files changed