Input: apbps2 - add __iomem to register struct

Add __iomem to the apbps2_priv.regs field to make the numerous
warnings about differing address spaces go away. Fixes warnings
such as:

drivers/input/serio/apbps2.c:65:26: warning: incorrect type in argument 1 (different address spaces)
drivers/input/serio/apbps2.c:65:26:    expected void const volatile [noderef] <asn:2> *addr
drivers/input/serio/apbps2.c:65:26:    got unsigned int [noderef] *
drivers/input/serio/apbps2.c:65:26: warning: incorrect type in argument 1 (different address spaces)
drivers/input/serio/apbps2.c:65:26:    expected void const volatile [noderef] <asn:2> *addr
drivers/input/serio/apbps2.c:65:26:    got unsigned int [noderef] *
drivers/input/serio/apbps2.c:65:26: warning: incorrect type in argument 1 (different address spaces)
drivers/input/serio/apbps2.c:65:26:    expected void const volatile [noderef] <asn:2> *addr
drivers/input/serio/apbps2.c:65:26:    got unsigned int [noderef] *
drivers/input/serio/apbps2.c:65:26: warning: incorrect type in argument 1 (different address spaces)
drivers/input/serio/apbps2.c:65:26:    expected void const volatile [noderef] <asn:2> *addr
[rest snipped]

Signed-off-by: Ben Dooks (Codethink) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Torokhov <[email protected]>

Author: bjdooks-ct

drivers/input/serio/apbps2.c

@@ -51,7 +51,7 @@ struct apbps2_regs {
 
 struct apbps2_priv {
 	struct serio		*io;
-	struct apbps2_regs	*regs;
+	struct apbps2_regs	__iomem *regs;
 };
 
 static int apbps2_idx;