ARM: mach-realview and mach-versatile: retire custom LED code

This replaces the custom LED trigger code in mach-realview with
some overarching platform code for the plat-versatile family that
will lock down LEDs 2 thru 5 for CPU activity indication. The
day we have 8 core ARM systems the plat-versatile code will have
to become more elaborate.

Tested on RealView PB11MPCore by invoking four different CPU
hogs (yes > /dev/null&) and see the LEDs go on one at a time.
They all go off as the hogs are killed. Tested on the PB1176
as well - just one activity led (led 2) goes on and off with
CPU activity.

([email protected]: use ledtrig-cpu instead of ledtrig-arm-cpu)

Cc: Richard Purdie <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Bryan Wu <[email protected]>
Acked-by: Pawel Moll <[email protected]>

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