ARM: ux500: move mach/msp.h to <linux/platform_data/*>

This header file only contains platform data structure definitions,
so it's straightforward to move.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
[Delete one include rather than move it]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>