ARM: dts: dra7: Disable metastability workaround for USB2

Disable the metastability workaround for USB2. The original
patch disabled the workaround on the wrong USB port.

Fixes: b8c9c6fa

 ("ARM: dts: dra7: Disable USB metastability workaround for USB2")
Cc: <stable@vger.kernel.org>        [4.16+]
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>