PCMCIA: soc_common: constify soc_pcmcia_socket ops member

No one should modify the ops structure supplied to soc_pcmcia_socket
so make it const.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
diff --git a/drivers/pcmcia/soc_common.h b/drivers/pcmcia/soc_common.h
index 8a755c1..f7533dc 100644
--- a/drivers/pcmcia/soc_common.h
+++ b/drivers/pcmcia/soc_common.h
@@ -37,7 +37,7 @@
 	/*
 	 * Core PCMCIA state
 	 */
-	struct pcmcia_low_level *ops;
+	const struct pcmcia_low_level *ops;
 
 	unsigned int		status;
 	socket_state_t		cs_state;