ARM: OMAP2+: Drop legacy hwmod data for omap3 otg

With complete devicetree data available to probe with ti-sysc interconnect
target module driver, we can now drop the related SoC data.

Cc: H. Nikolaus Schaller <hns@goldelico.com>
Tested-by: Sicelo A. Mhlongo <absicsz@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>