[ARM] pxa: fix the warning of undeclared "struct pxaohci_platform_data"

The header file <asm/arch/ohci.h> was missing in the original file,
include it to fix the warning.

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