ARM: dts: am335x-sl50: Fix card detect pin for mmc1

ARM: dts: am335x-sl50: Fix card detect pin for mmc1

BugLink: http://bugs.launchpad.net/bugs/1700372
commit 56b74ed9c1e8050408b9beeee25888a49a458997 upstream.

The second version of the hardware moved the card detect pin from gpio0_6
to gpio1_9, as we won't support the first hardware version fix the pinmux
configuration of this pin.

Fixes: 8584d4fc ("ARM: dts: am335x-sl50: Add Toby-Churchill SL50 board support.")
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>