Merge changes I8ea4ea58,I1f0b4aab,I2cccad40 into integration

* changes:
  marvell: uart: a3720: Increase TX FIFO EMPTY timeout from 2ms to 3ms
  marvell: uart: a3720: Update delay code to be compatible with 1200 MHz CPU
  marvell: uart: a3720: Fix comments in console_a3700_core_init() function