This prepares *of_device_id.data becoming const. Without this change
the following warning would occur:
	drivers/misc/atmel_tclib.c: In function 'tc_probe':
	drivers/misc/atmel_tclib.c:170: warning: assignment discards qualifiers from pointer target type
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
        struct platform_device  *pdev;
        struct resource         *iomem;
        void __iomem            *regs;
-       struct atmel_tcb_config *tcb_config;
+       const struct atmel_tcb_config *tcb_config;
        int                     irq[3];
        struct clk              *clk[3];
        struct list_head        node;