MIPS: Loongson1C: Add board support

Adds basic platform devices for Loongson1C, including serial port
and ethernet.

Signed-off-by: Yang Ling <gnaygnil@gmail.com>
Cc: keguang.zhang@gmail.com
Cc: chenhc@lemote.com
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/13304/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/loongson32/common/setup.c

@@ -22,7 +22,11 @@ const char *get_system_type(void)
 
 	switch (processor_id & PRID_REV_MASK) {
 	case PRID_REV_LOONGSON1B:
+#if defined(CONFIG_LOONGSON1_LS1B)
 		return "LOONGSON LS1B";
+#elif defined(CONFIG_LOONGSON1_LS1C)
+		return "LOONGSON LS1C";
+#endif
 	default:
 		return "LOONGSON (unknown)";
 	}