ARM: dts: omap3-gta04: explicitly describe that mmc1 has no CD/WP

There are neither CD nor WP switches for mmc1. The µSD slot is
located under the SIM card under the battery and not accessible
during operation.

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>