-Xilinx INTC  serial

Fixed:
~ # cat /proc/interrupts
           CPU0
  2:          2  Xilinx INTC-level     eth0
  3:          2  Xilinx INTC-level     eth0
  4:        238  Xilinx INTC-edge      timer
  6:        108  Xilinx INTC-level     serial

Signed-off-by: Michal Simek <monstr@monstr.eu>
Acked-by: Thomas Gleixner <tglx@linutronix.de>

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v2: Fix exchanged edge and level
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