i2c: Fix i2c_qmsi_configure()

In the initial version of the I2C shim driver, the i2c clock gate was
enabled within i2c_qmsi_configure(). After some review rounds we decided
to move it to i2c_qmsi_init() but missed to remove the clk_periph_disable
call within i2c_qmsi_configure(). So this patch removes it.

Change-Id: Id45dba2e00a5649846d305399bc1b2b275063cb6
Signed-off-by: Andre Guedes <andre.guedes@intel.com>