Change FIOC_MMAP into file operation call

- Add mmap into file_operations and remove it from ioctl definitions.
- Add mm_map structure definitions to support future unmapping
- Modify all drivers to initialize the operations struct accordingly

Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>

drivers/lcd/ft80x.c

@@ -135,6 +135,7 @@ static const struct file_operations g_ft80x_fops =
   NULL,          /* seek */
   ft80x_ioctl,   /* ioctl */
   NULL,          /* truncate */
+  NULL,          /* mmap */
   NULL           /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , ft80x_unlink /* unlink */

drivers/lcd/pcf8574_lcd_backpack.c

@@ -118,6 +118,7 @@ static const struct file_operations g_pcf8574_lcd_fops =
   pcf8574_lcd_seek,             /* seek */
   pcf8574_lcd_ioctl,            /* ioctl */
   NULL,                         /* truncate */
+  NULL,                         /* mmap */
   pcf8574_lcd_poll              /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , pcf8574_lcd_unlink          /* unlink */

drivers/lcd/tda19988.c

@@ -171,6 +171,7 @@ static const struct file_operations tda19988_fops =
   tda19988_seek,     /* seek */
   tda19988_ioctl,    /* ioctl */
   NULL,              /* truncate */
+  NULL,              /* mmap */
   tda19988_poll      /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , tda19988_unlink  /* unlink */