All device drivers have stopped relying on mach/*.h headers,
so move the remaining headers into arch/arm/mach-lpc32xx/lpc32xx.h
to prepare for multiplatform builds.

The mach/entry-macro.S file has been unused for a long time now
and can simply get removed.

Link: https://lore.kernel.org/r/20190809144043.476786-13-arnd@arndb.deAcked-by: Sylvain Lemieux <slemieux.tyco@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>