it83xx: i2c: don't check bus busy if transaction is ongoing.
it83xx: i2c: don't check bus busy if transaction is ongoing.

This CL fixes that i2c driver will prompt "I2C chx reset cause 1" issue
when one i2c transaction is separated into at least three i2c_xfer and
I2C_XFER_START flag is set at least two times.
eg.
- i2c_xfer with I2C_XFER_START flag
- i2c_xfer with I2C_XFER_START flag <= this will cause reset
- xxx
- i2c_xfer with I2C_XFER_STOP flag

BRANCH=none
BUG=none
TEST=no i2c reset on Asurada, Drawcia, and ADL-RVP.

Signed-off-by: Dino Li <338d523ecf3700bd86eb9c34d220f91911d2a18c@ite.com.tw>
Change-Id: I97161db0bb0c54de3ad55d82512a6a188036270f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3058724
Tested-by: Vijay Hiremath <006c712879a3af08bfdb5c2b8491a8b2d5fd73cd@intel.com>
Reviewed-by: Eric Yilun Lin <2f2733c7206ea2b76bd2db1905cc5e8a75841c48@google.com>

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