[U-Boot] at91: fix a USB problem for AT91SAM9261

[RONETIX - Ilko Iliev <iliev@ronetix.at>]

This patch corrects the missing PLLB initialization in usb_cpu_init() 
for AT91SAM9261.
Because of the missing PLLB initialization, the USB support for all 
AT91SAM9261 based boards doesn't work.

Signed-off-by: Ilko Iliev <iliev@ronetix.at>

diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index c35319c..4066820 100644
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -34,7 +34,8 @@ int usb_cpu_init(void)
 {

 #if defined(CONFIG_AT91CAP9) || defined(CONFIG_AT91SAM9260) || \
-    defined(CONFIG_AT91SAM9263) || defined(CONFIG_AT91SAM9G20)
+    defined(CONFIG_AT91SAM9263) || defined(CONFIG_AT91SAM9G20) || \
+    defined(CONFIG_AT91SAM9261)
        /* Enable PLLB */
        at91_sys_write(AT91_CKGR_PLLBR, get_pllb_init());
        while ((at91_sys_read(AT91_PMC_SR) & AT91_PMC_LOCKB) != 
AT91_PMC_LOCKB)