Removing dead MACH_OMAP2_H4_USB1

MACH_OMAP2_H4_USB1 doesn't exist in Kconfig, therefore removing all
references for it from the source code.

Signed-off-by: Christoph Egger <siccegge@cs.fau.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>