ARM: pxa: redefine irqs.h

Define all IRQs in irqs.h. If some IRQs are sharing one IRQ number, define
them together. If some IRQs are sharing same name with different IRQ number,
define different IRQ.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Cc: Eric Miao <eric.y.miao@gmail.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>