ns16550.c: Fix for ns16550 driver hanging on OMAP4

The same problem that is seen on some OMAP3 is also seen on some OMAP4
so include them in the test in order to prevent some hangs during SPL.

[trini: Re-word commit message, make apply cleanly]
Signed-off-by: Tom Rini <trini@ti.com>
1 file changed