util: ecst: Add support for npcx7 series.

ecst adds the support for npcx7 series in this CL. (The name of npcx7m6f
is fixed. The others are TBD.) It also includes:
1. Fix few typos and replace tab with spaces in ecst.h for better
   alignment.
2. Add -spiclkratio parameter for the ratio between core and spi flash
   clock in npcx7. (default ratio is 1.)
3. Add -unlimburst parameter for burst mode of spi flash accesses.
   (default is disable)

BRANCH=none
BUG=none
TEST=No build errors for npcx7 and npcx5 series. Build poppy board with
ecst 1.0.3 and upload FW to platfomr. No sympton found.

Change-Id: I004edc068c6496390e03d8ee5e39e4f23e4b835f
Signed-off-by: Mulin Chao <mlchao@nuvoton.com>
Reviewed-on: https://chromium-review.googlesource.com/476413
Reviewed-by: Randall Spangler <rspangler@chromium.org>
2 files changed