i915 fails to build on 32bit Systems

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i915.ko does not build due to the following function in i915_debugfs.c:

i915_min_freq_set(void *data, u64 val)
{
        ...
        dev_priv->rps.min_delay = val / GT_FREQUENCY_MULTIPLIER;
        ...
}

Doing a 64bit integer division on 32bit requires a
compiler run time library to be linked in, otherwise 
the symbol __udivdi3 will be missing.

This was introduced with 

commit 2389cc5006861a8e024a23cb73605f2ab6a5afe8
Author: Kees Cook <keescook at chromium.org>
Date:   Sun Mar 10 14:10:06 2013 -0700

    drm/i915: use simple attribute in debugfs routines

before this val was a simple int.

Cheers,
	Egbert.


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