tty: 8250: jz4780: Add MCR register bits for flow control.
These bits are not standard 550 uart.
For the serial module in the JZ4780, they need to be enabled
for flow control to work.
Found using old ingenic history to get BT to work on 3.16
Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
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Zubair Lutfullah Kakakhel
authored and Zubair Lutfullah Kakakhel
Oct 28, 2014