HSI: omap-ssi: include pinctrl header files

The driver now uses some pinctrl functions, but fails
to build if PINCTRL is disabled because the respective
header files are only included indirectly:

drivers/hsi/controllers/omap_ssi_core.c: In function 'ssi_clk_event':
drivers/hsi/controllers/omap_ssi_core.c:317:4: error: implicit declaration of function 'pinctrl_pm_select_idle_state' [-Werror=implicit-function-declaration]
drivers/hsi/controllers/omap_ssi_core.c:339:4: error: implicit declaration of function 'pinctrl_pm_select_default_state' [-Werror=implicit-function-declaration]
drivers/hsi/controllers/omap_ssi_port.c: In function 'ssi_flush':
drivers/hsi/controllers/omap_ssi_port.c:520:2: error: implicit declaration of function 'pinctrl_pm_select_idle_state' [-Werror=implicit-function-declaration]

This includes the headers from the files that call the functions,
which works even if pinctrl is turned off.

Signed-off-by: Arnd Bergmann <[e-mail]>
Fixes: 4bcf7414528a ("HSI: omap-ssi: add clk change support")
Signed-off-by: Sebastian Reichel <[e-mail]>

drivers/hsi/controllers/omap_ssi_core.c

···
 #include <linux/interrupt.h>
 #include <linux/spinlock.h>
 #include <linux/debugfs.h>
+#include <linux/pinctrl/consumer.h>
 #include <linux/pm_runtime.h>
 #include <linux/of_platform.h>
 #include <linux/hsi/hsi.h>

drivers/hsi/controllers/omap_ssi_port.c

···
 #include <linux/delay.h>
 
 #include <linux/gpio/consumer.h>
+#include <linux/pinctrl/consumer.h>
 #include <linux/debugfs.h>
 
 #include "omap_ssi_regs.h"