fbtft: fix to 40mhz since its our SPI frequency, one less parameter to load the module

Change-Id: I6af684d03b62fc3f1fa863d281a01b6b65ffff1a

drivers/video/fbtft/fbtft_device.c

@@ -326,7 +326,7 @@ static struct fbtft_device_display displays[] = {
 		.name = "hktft9340",
 		.spi = &(struct spi_board_info) {
 			.modalias = "fb_ili9340",
-			.max_speed_hz = 32000000,
+			.max_speed_hz = 40000000,
 			.mode = SPI_MODE_0,
 			.controller_data = &odroid32_controller_data,
 			.platform_data = &(struct fbtft_platform_data) {