[ARM] 5135/1: pxa: drop superfluous asm/arch/pxa2xx-gpio.h includes

Both i2c-pxa.c and irq.c still include pxa2xx-gpio.h although is is not
needed anymore.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Acked-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>