ARM: da850evm: Remove legacy OHCI referencs and unify platform

OHCI was added with DM_USB support, so there are a few unneeded
items in the header file that can be removed.  This also
unifies da850evm with NOR and NAND booting options so all have
OHCI support.

Signed-off-by: Adam Ford <aford173@gmail.com>
[trini: Migrate da850_am18xxevm]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/da850evm_defconfig b/configs/da850evm_defconfig
index f7c679d..99300cb 100644
--- a/configs/da850evm_defconfig
+++ b/configs/da850evm_defconfig
@@ -74,5 +74,6 @@
 # CONFIG_SPL_DM_USB is not set
 CONFIG_USB_OHCI_HCD=y
 CONFIG_USB_OHCI_DA8XX=y
+CONFIG_USB_STORAGE=y
 # CONFIG_FAT_WRITE is not set
 CONFIG_USE_TINY_PRINTF=y