ARM: pxa: fix now incorrect reference of skt->irq by using skt->socket.pci_irq

commit 66024db5 removes all other references of skt->irq by using
skt->socket.pci_irq, while leaving these two missed. Get them fixed.

Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>