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>

drivers/pcmcia/soc_common.h

@@ -37,7 +37,7 @@ struct soc_pcmcia_socket {
 	/*
 	 * Core PCMCIA state
 	 */
-	struct pcmcia_low_level *ops;
+	const struct pcmcia_low_level *ops;
 
 	unsigned int		status;
 	socket_state_t		cs_state;