ish: use correct I2C event
ish: use correct I2C event

There is a section of event bits that are reserved for all tasks.
We need to use one of the upper bits instead of a bit 7 which may
conflict with other tasks eventually.

BRANCH=none
BUG=none
TEST=i2c transaction still works

Change-Id: Ie8b98f7a159159714f12dc87ce26b009ceee3f92
Signed-off-by: Jett Rink <9d4aef0593e6843318d99df31597fb6153b89787@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1435479
Reviewed-by: Furquan Shaikh <6be5c96c464778f89679b1062a2e0a6af93d2aa5@chromium.org>
Reviewed-by: Edward Hill <db1406b34e091703092b6b136bdfeb2c8125fc0e@chromium.org>
Reviewed-by: Diana Z <cb2016afc7183e5356c690dc63b4ba817470501a@chromium.org>

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