[SPARC]: introduce a SPARC Kconfig symbol

Introduce a Kconfig symbol SPARC that is defined on both the sparc and
sparc64 architectures.

This symbol makes some dependencies more readable.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 3cfb8be..56c34e7 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -55,6 +55,10 @@
 	depends on SMP
 	default "32"
 
+config SPARC
+	bool
+	default y
+
 # Identify this as a Sparc32 build
 config SPARC32
 	bool