ARM: iop32x: replace setup_irq() by request_irq()

ARM: iop32x: replace setup_irq() by request_irq()

request_irq() is preferred over setup_irq(). Invocations of setup_irq()
occur after memory allocators are ready.

Per tglx[1], setup_irq() existed in olden days when allocators were not
ready by the time early interrupts were initialized.

Hence replace setup_irq() by request_irq().

[1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos

Link: https://lore.kernel.org/r/20200327124451.4298-1-afzal.mohd.ma@gmail.com
Signed-off-by: afzal mohammed <afzal.mohd.ma@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>