MIPS: c-r4k: Add r4k_blast_scache_node for Loongson-3

MIPS: c-r4k: Add r4k_blast_scache_node for Loongson-3

For multi-node Loongson-3 (NUMA configuration), r4k_blast_scache() can
only flush Node-0's scache. So we add r4k_blast_scache_node() by using
(CAC_BASE | (node_id << NODE_ADDRSPACE_SHIFT)) instead of CKSEG0 as the
start address.

Signed-off-by: Huacai Chen <[email protected]>
[[email protected]: Include asm/mmzone.h from asm/r4kcache.h for
		       nid_to_addrbase(). Add asm/mach-generic/mmzone.h
		       to allow inclusion for all platforms.]
Signed-off-by: Paul Burton <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/21129/
Cc: Ralf Baechle <[email protected]>
Cc: James Hogan <[email protected]>
Cc: Steven J . Hill <[email protected]>
Cc: [email protected]
Cc: Fuxin Zhang <[email protected]>
Cc: Zhangjin Wu <[email protected]>
Cc: <[email protected]> # 3.15+