ARM: ux500: fix pin warning

Recent pin changes produce this warning:

arch/arm/mach-ux500/board-mop500-pins.c:73:22:
error: 'out_hi_wkup_pdis' defined but not used
[-Werror=unused-variable]

Fix this by deleting the offending definition.

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>