davinci: DM646x: pass correct MUSB IRQs

DM646x has MUSB connected to IRQs 13 and 14 (unlike IRQ12 on other platforms),
so pass the correct IRQ resources with the platform device.

Signed-off-by: Dmitry Krivoschekov <dkrivoschekov@ru.mvista.com>
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>