ARM: remove unnecessary mach/hardware.h includes

Remove some includes of mach/hardware.h which are not needed. hardware.h
will be removed completely for tegra and cns3xxx in follow on patch.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>