Create an intx.py which is a static allocator to allocate the irq
resources. The available irq list is based on the native irqs which
are in range [0, 15] and are not used by native os.
Tracked-On: #5980
Signed-off-by: Yang,Yu-chu <yu-chu.yang@intel.com>
Reviewed-by: Junjie Mao <junjie.mao@intel.com>
