FIFO Underrun: Increase pixclock and right_margin

Increase right_margin, so DMA have enough time to move the data
Also increase pixclock, so the frame rate will not drop

Signed-off-by: LiuXin <liuxing@embedinfo.com>
I2C Timeout: Fix the i2c timeout problem

Change the clock rate of TWI0/1 controller

Signed-off-by: LiuXin <liuxing@embedinfo.com>