mtd: nand: MTD_NAND_ECC_REALTEK should depend on HAS_DMA

If CONFIG_NO_DMA=y:

    ERROR: modpost: "dma_free_pages" [drivers/mtd/nand/ecc-realtek.ko] undefined!
    ERROR: modpost: "dma_alloc_pages" [drivers/mtd/nand/ecc-realtek.ko] undefined!

The driver cannot function without DMA, hence fix this by adding a
dependency on HAS_DMA.

Fixes: 3148d0e ("mtd: nand: realtek-ecc: Add Realtek external ECC engine support")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

Author: geertu

drivers/mtd/nand/Kconfig

@@ -63,7 +63,7 @@ config MTD_NAND_ECC_MEDIATEK
 
 config MTD_NAND_ECC_REALTEK
         tristate "Realtek RTL93xx hardware ECC engine"
-        depends on HAS_IOMEM
+        depends on HAS_IOMEM && HAS_DMA
         depends on MACH_REALTEK_RTL || COMPILE_TEST
         select MTD_NAND_ECC
         help