mxs_nand: Add support for i.MX8M

Update the gpmi/apbh_dma/bch drivers and relevant registers for i.MX8M.

Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 4f37ba7..655e79f 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -44,7 +44,7 @@
 
 config APBH_DMA
 	bool "Support APBH DMA"
-	depends on MX23 || MX28 || MX6 || MX7
+	depends on MX23 || MX28 || MX6 || MX7 || IMX8M
 	help
 	  Enable APBH DMA driver.