at91: refresh kernel config, enable UBI block and DMA

The platform generates squashfs images in a UBI block but misses the
kernel module to be able to mount the block.
DMA is also enabled to allow systems which include them in the DTS to
use it.

Signed-off-by: Ben Whitten <ben.whitten@gmail.com>

target/linux/at91/config-4.4

@@ -39,6 +39,8 @@ CONFIG_ATMEL_AIC_IRQ=y
 CONFIG_ATMEL_PIT=y
 CONFIG_ATMEL_SDRAMC=y
 # CONFIG_ATMEL_TCLIB is not set
+CONFIG_AT_HDMAC=y
+# CONFIG_AT_XDMAC is not set
 CONFIG_AUTO_ZRELADDR=y
 # CONFIG_BLK_DEV_INITRD is not set
 # CONFIG_CACHE_L2X0 is not set
@@ -76,6 +78,9 @@ CONFIG_DEBUG_LL_INCLUDE="mach/debug-macro.S"
 # CONFIG_DEBUG_UART_8250 is not set
 # CONFIG_DEBUG_USER is not set
 CONFIG_DEVPTS_MULTIPLE_INSTANCES=y
+CONFIG_DMADEVICES=y
+CONFIG_DMA_ENGINE=y
+CONFIG_DMA_OF=y
 CONFIG_DTC=y
 CONFIG_EDAC_ATOMIC_SCRUB=y
 CONFIG_EDAC_SUPPORT=y
@@ -181,7 +186,7 @@ CONFIG_MTD_NAND_ECC=y
 CONFIG_MTD_PHYSMAP=y
 CONFIG_MTD_UBI=y
 CONFIG_MTD_UBI_BEB_LIMIT=20
-# CONFIG_MTD_UBI_BLOCK is not set
+CONFIG_MTD_UBI_BLOCK=y
 # CONFIG_MTD_UBI_FASTMAP is not set
 # CONFIG_MTD_UBI_GLUEBI is not set
 CONFIG_MTD_UBI_WL_THRESHOLD=4096