kernel.bbclass: use better number for KERNEL_PRIORITY
kernel.bbclass: use better number for KERNEL_PRIORITY

* there is no upgrade from 2.6.X to 3.X.Y
  last part of PV is used as kernel priority for u-a, but X is usually higher then Y in 3.x.x
  so use all 3 parts in one bigger number
* and make it weak assignment if this scheme doesn't work for some
  recipe

Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

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