LoongArch: Fix NUMA node parsing with numa_memblks

LoongArch: Fix NUMA node parsing with numa_memblks

On physical machine, NUMA node id comes from high bit 44:48 of physical
address. However it is not true on virt machine. With general method, it
comes from ACPI SRAT table.

Here the common function numa_memblks_init() is used to parse NUMA node
information with numa_memblks.

Cc: <stable@vger.kernel.org>
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>