powerpc/t4240: updated RCW and PBI for rev2.0

powerpc/t4240: updated RCW and PBI for rev2.0

Updated the RCW for rev2.0 which uses new frequency settings as below:

Clock Configuration:
CPU0:1666.667 MHz, CPU1:1666.667 MHz, CPU2:1666.667 MHz, CPU3:1666.667 MHz,
CPU4:1666.667 MHz, CPU5:1666.667 MHz, CPU6:1666.667 MHz, CPU7:1666.667 MHz,
CPU8:1666.667 MHz, CPU9:1666.667 MHz, CPU10:1666.667 MHz, CPU11:1666.667MHz,
CCB:733.333 MHz,
DDR:933.333 MHz (1866.667 MT/s data rate) (Asynchronous), IFC:183.333 MHz
FMAN1: 733.333 MHz
FMAN2: 733.333 MHz
QMAN:  366.667 MHz
PME:   533.333 MHz

Remove workaround of IFC bus speed and SERDES A-006031 of rev1.0.

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>