mach-integrator: delete bits.h include file

Not only does this file duplicate <linux/bitops.h> and implement a
well-known antipattern, it is also not used by anything.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>