[bsp][c908] Added support for rt-smart, MMU sv39/48, and SMP to QEMU xiaohui c908, and added mmu_demo and smp_test for test. - #11775

[bsp][c908] Added support for rt-smart, MMU sv39/48, and SMP to QEMU xiaohui c908, and added mmu_demo and smp_test for test.#11775

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