pata: ixp4xx: Add explicit include for of.h

With linux/acpi.h no longer implicitly including of.h, add an explicit
include of of.h to fix the following error:

drivers/ata/pata_ixp4xx_cf.c:258:15: error: implicit declaration of function 'of_property_read_u32_index'; did you mean 'fwnode_property_read_u32_array'? [-Werror=implicit-function-declaration]
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/ata/pata_ixp4xx_cf.c

@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/libata.h>
 #include <linux/irq.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <scsi/scsi_host.h>