ARM: da850evm: Split MTDPARTS into SPL and u-boot

The MTDPARTS currently lists just u-boot.ais as 512k in size.
This works when loading the ais file via serial port, but if one
wanted to update just the u-boot portion, it's not really possible.
This patch splits the MTDPARTS into a 32k SPL partiion and a 480k
u-boot partition which allows u-boot.img to be burned to the u-boot
partition.  The remaining partitions are left with the same sizes
and offsets to not break backwards compatibility.

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/configs/da850evm_defconfig b/configs/da850evm_defconfig
index 7de1d2f..dd0eb98 100644
--- a/configs/da850evm_defconfig
+++ b/configs/da850evm_defconfig
@@ -36,7 +36,7 @@
 CONFIG_CMD_FS_UUID=y
 CONFIG_CMD_MTDPARTS=y
 CONFIG_MTDIDS_DEFAULT="nor0=spi0.0"
-CONFIG_MTDPARTS_DEFAULT="mtdparts=spi0.0:512k(u-boot.ais),64k(u-boot-env),7552k(kernel-spare),64k(MAC-Address)"
+CONFIG_MTDPARTS_DEFAULT="mtdparts=spi0.0:32k(SPL),480k(u-boot),64k(u-boot-env),7552k(kernel-spare),64k(MAC-Address)"
 CONFIG_CMD_DIAG=y
 CONFIG_OF_CONTROL=y
 CONFIG_SPL_OF_CONTROL=y
@@ -77,4 +77,3 @@
 CONFIG_USB_OHCI_DA8XX=y
 CONFIG_USB_STORAGE=y
 # CONFIG_FAT_WRITE is not set
-CONFIG_USE_TINY_PRINTF=y