zephyr: Have zmake log every command run at DEBUG
zephyr: Have zmake log every command run at DEBUG

If you want to see the command line of cmake and ninja, this is helpful.

BUG=b:183007888
TEST=zmake -l DEBUG
BRANCH=none

Change-Id: Icb8baebd36349b1b1a83e74c3ae6dec05bd28ae1
Signed-off-by: Jeremy Bettis <4df7b5147fee087dca33c181f288ee7dbf56e022@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2786064
Reviewed-by: Jack Rosenthal <d3f605bef1867f59845d4ce6e4f83b8dc9e4e0ae@chromium.org>
Commit-Queue: Jeremy Bettis <4df7b5147fee087dca33c181f288ee7dbf56e022@chromium.org>
Tested-by: Jeremy Bettis <4df7b5147fee087dca33c181f288ee7dbf56e022@chromium.org>

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