mfd: Add additional WM8994 GPIO functions

Later revisions of the WM8994 add some more GPIO functions, define them
in the header file.

Signed-off-by: Mark Brown <[e-mail]>
Signed-off-by: Samuel Ortiz <[e-mail]>

include/linux/mfd/wm8994/gpio.h

···
 #define WM8994_GP_FN_WSEQ_STATUS    16
 #define WM8994_GP_FN_FIFO_ERROR     17
 #define WM8994_GP_FN_OPCLK          18
+#define WM8994_GP_FN_THW	    19
+#define WM8994_GP_FN_DCS_DONE	    20
+#define WM8994_GP_FN_FLL1_OUT       21
+#define WM8994_GP_FN_FLL2_OUT       22
 
 #define WM8994_GPN_DIR                          0x8000  /* GPN_DIR */
 #define WM8994_GPN_DIR_MASK                     0x8000  /* GPN_DIR */