sh: Add a new mach type for alpha project boards.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/boards/Kconfig b/arch/sh/boards/Kconfig
index 2018c7e..3bac817 100644
--- a/arch/sh/boards/Kconfig
+++ b/arch/sh/boards/Kconfig
@@ -3,6 +3,9 @@
 config SOLUTION_ENGINE
 	bool
 
+config SH_ALPHA_BOARD
+	bool
+
 config SH_SOLUTION_ENGINE
 	bool "SolutionEngine"
 	select SOLUTION_ENGINE