ITE: drivers/i2c/target: Remove hardware reset setting

In the interrupt pending routine, only the interrupt status needs to be
cleared at the end of the interrupt routine. There is no need to do a
hardware reset(HALT) to avoid clearing the next transfer interrupt when
the current transfer is completed.

Test: Testing this function does not cause I2C data/clk to get stuck on
the system platform.

Signed-off-by: Tim Lin <tim2.lin@ite.corp-partner.google.com>