zmake: Stop logging the date and logger name.
zmake: Stop logging the date and logger name.

Instead of logging `date Logger/LEVEL: message`, just log
`LEVEL: message`.

BUG=b:184298184
TEST=zmake testall
BRANCH=None

Signed-off-by: Jeremy Bettis <4df7b5147fee087dca33c181f288ee7dbf56e022@google.com>
Change-Id: Ic88b0e05e51acd3ee68662f18c9cdf41615442df
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2863942
Tested-by: Jeremy Bettis <4df7b5147fee087dca33c181f288ee7dbf56e022@chromium.org>
Reviewed-by: Jack Rosenthal <d3f605bef1867f59845d4ce6e4f83b8dc9e4e0ae@chromium.org>
Commit-Queue: Jeremy Bettis <4df7b5147fee087dca33c181f288ee7dbf56e022@chromium.org>

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