mec1322: make i2c transactions faster by not sleeping task
mec1322: make i2c transactions faster by not sleeping task

Modify i2c driver on mec1322 to change from sleeping and waking
on i2c interrupt, to just doing a blocking wait for i2c transfer
to complete. This greatly improves the i2c transaction time on
fast busses.

BUG=chrome-os-partner:43416
BRANCH=none
TEST=test on glados. test can talk to battery and PD MCU. Use
logic analyzer to see delay between bytes during an i2c transfer.
The delay goes from ~70us to ~4us.

Change-Id: Iee2a903d27b2e50e54d64bd6d5ed4920293fe575
Signed-off-by: Alec Berg <1a4429eeda29095a12e19a73405f80f5b7f37a63@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/289667
Reviewed-by: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>

coreboot/chrome-ec,fourier49/BZ_DEV_EC,fourier49/BZ_DEV_EC,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,fourier49/BZ_DEV_EC,fourier49/BZ_DEV_EC,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics