drm/i915/selftests: Use mul_u32_u32() for 32b x 32b -> 64b result
As realised by commit 9e3d6223 ("math64, timers: Fix 32bit mul_u64_u32_shr() and friends"), GCC does not always generate ideal code for performing a 32b x 32b multiply returning a 64b result (i.e. where we idiomatically use u64 result = (u64)x * (u32)x). Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20170913105154.2910-2-chris@chris-wilson.co.ukReviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
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