common: Hide hcdebug_mode_names behind CONFIG_CMD_HCDEBUG
common: Hide hcdebug_mode_names behind CONFIG_CMD_HCDEBUG

Signed-off-by: Stefan Reinauer <0ab4fef0c228799b0c44e01c732054569b690b58@chromium.org>
BUG=none
BRANCH=none
TEST=compile tested for Samus

Change-Id: I4e11f61a8f0171a3b5db64358619d8fcb0784591
Reviewed-on: https://chromium-review.googlesource.com/343241
Commit-Ready: Stefan Reinauer <0ab4fef0c228799b0c44e01c732054569b690b58@chromium.org>
Tested-by: Stefan Reinauer <0ab4fef0c228799b0c44e01c732054569b690b58@chromium.org>
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

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