npcx7_evb: Disabling fans happens by undefining it
npcx7_evb: Disabling fans happens by undefining it

Otherwise the code is compiled in (and then discarded presumably),
just that gcc 11 doesn't like working on zero-sized arrays.

BUG=none
BRANCH=none
TEST=one class of error less with gcc 11

Signed-off-by: Patrick Georgi <bc411205f21846a74924ee7b489c75617ec76078@google.com>
Change-Id: Ia68aa138993794941e9cde99dc9d2547d05d7f99
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2959921
Reviewed-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>
Commit-Queue: Patrick Georgi <bc411205f21846a74924ee7b489c75617ec76078@chromium.org>
Tested-by: Patrick Georgi <bc411205f21846a74924ee7b489c75617ec76078@chromium.org>

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