MIPS: JZ4740: introduce CONFIG_MACH_INGENIC

In preparation for supporting Ingenic SoCs other than the JZ4740,
introduce MACH_INGENIC to Kconfig & move MACH_JZ4740 to a separate
entry selected by the board when appropriate. This allows MACH_INGENIC
to be used to enable things generic across Ingenic SoCs.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: Andrew Bresticker <abrestic@chromium.org>
Patchwork: https://patchwork.linux-mips.org/patch/10130/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/jz4740/Kconfig b/arch/mips/jz4740/Kconfig
index 4689030..dff0966 100644
--- a/arch/mips/jz4740/Kconfig
+++ b/arch/mips/jz4740/Kconfig
@@ -1,9 +1,14 @@
 choice
 	prompt "Machine type"
-	depends on MACH_JZ4740
+	depends on MACH_INGENIC
 	default JZ4740_QI_LB60
 
 config JZ4740_QI_LB60
 	bool "Qi Hardware Ben NanoNote"
+	select MACH_JZ4740
 
 endchoice
+
+config MACH_JZ4740
+	bool
+	select SYS_HAS_CPU_MIPS32_R1