pinctrl: samsung: Allow per-bank SoC-specific private data

This patch extends pin bank descriptor structure with SoC-specific
private data field that allows SoC-specific drivers to store their own
private data.

Signed-off-by: Tomasz Figa <[e-mail]>
Signed-off-by: Kyungmin Park <[e-mail]>
Tested-by: Doug Anderson <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/pinctrl-samsung.h

···
 	u32		eint_mask;
 	u32		eint_offset;
 	char		*name;
+	void		*soc_priv;
 	struct device_node *of_node;
 	struct samsung_pinctrl_drv_data *drvdata;
 	struct irq_domain *irq_domain;