staging: mt7621-mmc: Remove code guarded by nonexistent config option

Remove a piece of code that is guarded by a config option, that is
nonexistent, the function it calls is also nonexistent.
Signed-off-by: Christian Lütke-Stetzkamp <christian@lkamp.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-mmc/sd.c

@@ -2985,13 +2985,6 @@ static int __init mt_msdc_init(void)
 /* +++ by chhung */
 	u32 reg;
 
-#if defined(CONFIG_MTD_ANY_RALINK)
-	extern int ra_check_flash_type(void);
-	if (ra_check_flash_type() == 2) { /* NAND */
-		printk("%s: !!!!! SDXC Module Initialize Fail !!!!!", __func__);
-		return 0;
-	}
-#endif
 	printk("MTK MSDC device init.\n");
 	mtk_sd_device.dev.platform_data = &msdc0_hw;
 	if (ralink_soc == MT762X_SOC_MT7620A || ralink_soc == MT762X_SOC_MT7621AT) {