This patch fixes the I2C errors which were coming during the TI codec
demos. These errors were due bus lockup and inappropriate enabling of
interrupts.

The patch incorporates the following:

1. Enables GPIO power domain.
2. Duty cycle of 50% (Initially it was set to 27%, which is for full
   speed mode).  
3. udelay of 100 instead of the old while (cnt--) fix.
4. Enables the inetrrupts before writing to ICMDR register.
5. Sends a NACK and sends a clock on SCL line in case of cmd_complete
   failure and Bus busy error. 
Signed-off-by: Kevin Hilman <khilman@mvista.com>