arm: socfpga: Unreset NAND in SPL

If the system boots from NAND, make sure to de-assert the NAND IP
reset, otherwise the system will get stuck.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>

arch/arm/mach-socfpga/spl.c

@@ -40,6 +40,7 @@ u32 spl_boot_device(void)
 		return BOOT_DEVICE_RAM;
 	case 0x2:	/* NAND Flash (1.8V) */
 	case 0x3:	/* NAND Flash (3.0V) */
+		socfpga_per_reset(SOCFPGA_RESET(NAND), 0);
 		return BOOT_DEVICE_NAND;
 	case 0x4:	/* SD/MMC External Transceiver (1.8V) */
 	case 0x5:	/* SD/MMC Internal Transceiver (3.0V) */