powerpc/T104xRDB: Fix endian access issue on EHCI intinalization

This issue is exposed after commit 9000eddb ("drivers/usb/ehci:
Use platform-specific accessors"), the wrong endianness of EHCI
controller programing will cause USB function down.
Signed-off-by: NRan Wang <ran.wang_1@nxp.com>
Reviewed-by: NYork Sun <york.sun@nxp.com>

include/configs/T104xRDB.h

@@ -634,6 +634,7 @@ $(SRCTREE)/board/freescale/t104xrdb/t1042d4_sd_rcw.cfg
 #ifdef CONFIG_USB_EHCI_HCD
 #define CONFIG_USB_EHCI_FSL
 #define CONFIG_EHCI_HCD_INIT_AFTER_RESET
+#define CONFIG_EHCI_DESC_BIG_ENDIAN
 #endif
 #endif