zephyr: Add details for generating code coverage
zephyr: Add details for generating code coverage

Add details for generating code coverage

BRANCH=none
BUG=b:201602829
TEST=none

Signed-off-by: Al Semjonovs <c3a2ecb550cad1e7d5a943ca6241377f7b43ffc4@google.com>
Change-Id: I6273f998daba811fd8f404cadbc4c41a585d678d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3387813
Reviewed-by: Yuval Peress <50dc11c009bd4d7e9d9d15a383c1743ce5ee82ef@google.com>
Commit-Queue: Yuval Peress <50dc11c009bd4d7e9d9d15a383c1743ce5ee82ef@google.com>

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