sh: USB disable process is needed if romImage boot for EcoVec24

when you use romImage on EcoVec24, 1st Linux will enable USB device.
But no-one disable it.
So re-started Linux will get interrupt before USB driver is attached.
This patch disable USB device at first
Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/include/mach-ecovec24/mach/partner-jet-setup.txt

@@ -77,3 +77,6 @@ WAIT 1
 
 LIST "setup cache"
 ED 0xff00001c, 0x0000090b
+
+LIST "disable USB"
+EW 0xA4D80000, 0x0000