[ARM] Orion: remove error printks in ->map_irq() implementations

If all PCI devices are working as expected, the error printks in the
various implementations of ->map_irq() doesn't really provide any
useful info.  And if something is not working as expected, turning
on pci=debug gives you more useful information than the printk calls
in ->map_irq(), since the former also tells you which devices _did_
get IRQs successfully assigned.  Therefore, delete these printks
entirely.

Spotted by Russell King.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Acked-by: Russell King <linux@arm.linux.org.uk>