[ARM] ecard: add ecardm_iomap() / ecardm_iounmap()

Add devres ecardm_iomap() and ecardm_iounmap() for Acorn expansion
cards.  Convert all expansion card drivers to use them.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/serial/8250_acorn.c b/drivers/serial/8250_acorn.c
index 562ba74..b0ce8c5 100644
--- a/drivers/serial/8250_acorn.c
+++ b/drivers/serial/8250_acorn.c
@@ -54,7 +54,7 @@
 	info->num_ports = type->num_ports;
 
 	bus_addr = ecard_resource_start(ec, type->type);
-	info->vaddr = ioremap(bus_addr, ecard_resource_len(ec, type->type));
+	info->vaddr = ecardm_iomap(ec, type->type, 0, 0);
 	if (!info->vaddr) {
 		kfree(info);
 		return -ENOMEM;
@@ -91,7 +91,6 @@
 		if (info->ports[i] > 0)
 			serial8250_unregister_port(info->ports[i]);
 
-	iounmap(info->vaddr);
 	kfree(info);
 }