[UPSTREAM] Move backlight handling out of pcf50633 driver

[Andy Green]

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Somebody in the thread at some point said:

| Yes, that's what I have done below and it works well AFAICS.
|
| diff --git a/arch/arm/mach-s3c2440/mach-gta02.c
b/arch/arm/mach-s3c2440/mach-gta02.c

Can you update Balaji-tracking so I can take that into stable and apply
this?  It seems to be on top of things I don't have.

- -Andy
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