tegra20: common: fix USB_EHCI_TXFIFO_THRESH value

All other Tegra devices that define USB_EHCI_TXFIFO_THRESH use hex
representation, fix tegra20 to be the same format.
Signed-off-by: NPeter Robinson <pbrobinson@gmail.com>
Cc: Tom Warren <twarren@nvidia.com>
Cc: Stephen Warren <swarren@nvidia.com>
Signed-off-by: NTom Warren <twarren@nvidia.com>

include/configs/tegra20-common.h

@@ -78,7 +78,7 @@
  * parameter, the default (2) causes occasional Data Buffer Errors in OUT
  * packets depending on the buffer address and size.
  */
-#define CONFIG_USB_EHCI_TXFIFO_THRESH	10
+#define CONFIG_USB_EHCI_TXFIFO_THRESH	0x10
 #define CONFIG_EHCI_IS_TDI
 
 #define CONFIG_SYS_NAND_SELF_INIT