Partially revert "drm/i915: s/mdelay/msleep/" in ilk rps code
Partially revert "drm/i915: s/mdelay/msleep/" in ilk rps code

This reverts commit 6adfb1ef106bfe4b5ecb8bd75c4d037741d28a48.

Ironlake RPS code runs under an irqsave spinlock and hence sleeping
isn't allowed. Not a this long delay while blocking irqs isn't great
at all, but fixing the locking scheme is a lot more involved.

So just revert for now.

Cc: Ville Syrjälä <cd6e8d405ca90be3a03d5427c5b24fbd2d68dcc4@linux.intel.com>
Reported-by: kernel test robot <b1ed892af366400004b51f70e40351e33707b6c4@intel.com>
Signed-off-by: Daniel Vetter <c1b6782c4af8f0673da8923a0702a1832e5940f4@intel.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs