Disabled RX/RX FEMAC pause frames and increased PHY RX FIFO size to address RX FEMAC CRC/Alignment errors

Signed-off-by: SangeethaRao <sangeetha.rao@lsi.com>
The ARM dsb was, incorrectly, added to the PowerPC part of the driver.
Signed-off-by: John Jacques <john.jacques@lsi.com>