MIPS: EMMA: Kconfig reorganization

- Move EMMA related stuff into arch/mips/emma/Kconfig
- Create CONFIG_SOC_EMMA* to handle more EMMA SoCs effectively
- Rename CONFIG_MARKEINS into CONFIG_NEC_MARKEINS

Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/emma2rh/common/prom.c b/arch/mips/emma2rh/common/prom.c
index e14a2e3..97bf29e 100644
--- a/arch/mips/emma2rh/common/prom.c
+++ b/arch/mips/emma2rh/common/prom.c
@@ -33,7 +33,7 @@
 
 const char *get_system_type(void)
 {
-#if defined(CONFIG_MARKEINS)
+#ifdef CONFIG_NEC_MARKEINS
 	return "NEC EMMA2RH Mark-eins";
 #else
 #error  Unknown NEC board
@@ -60,7 +60,7 @@
 		strcat(arcs_cmdline, " ");
 	}
 
-#if defined(CONFIG_MARKEINS)
+#ifdef CONFIG_NEC_MARKEINS
 	add_memory_region(0, EMMA2RH_RAM_SIZE, BOOT_MEM_RAM);
 #else
 #error  Unknown NEC board