config: add flag for ITE EC programming over CCD
config: add flag for ITE EC programming over CCD

This flag will allow to enable inclusion of the relevant source files
in common directories.

BRANCH=none
BUG=b:75976718
TEST=none

Change-Id: I037f811d0b8fd7327534f02f759eead3fd8f3de0
Signed-off-by: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1305115
Reviewed-by: Mary Ruthven <81380f3403fed74252e92df3ed012a1819ec6296@chromium.org>

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