ARM: ep93xx: Move ts72xx.h out of include/mach

The ts72xx.h header is only included by arch/arm/mach-ep93xx/ts72xx.c.
It therefore does not need to be in the globally exported include/mach
directory. Move it to to arch/arm/mach-ep93xx.

Signed-off-by: Ryan Mallon <rmallon@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>