sh: Preliminary SDK7786 board support.

This stubs in some preliminary board support for the RTE SDK7786.

This is quite stunted at the moment, and primarily builds on top of the
system FPGA. FPGA IRQs are handled via CPU IRL masking for simplicity,
with initial peripheral support restricted to the debug ethernet.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/boards/Kconfig b/arch/sh/boards/Kconfig
index aedd9de..c0a1992 100644
--- a/arch/sh/boards/Kconfig
+++ b/arch/sh/boards/Kconfig
@@ -150,6 +150,13 @@
 	  Select SDK7780 if configuring for a Renesas SH7780 SDK7780R3
 	  evaluation board.
 
+config SH_SDK7786
+	bool "SDK7786"
+	depends on CPU_SUBTYPE_SH7786
+	help
+	  Select SDK7786 if configuring for a Renesas Technology Europe
+	  SH7786-65nm board.
+
 config SH_HIGHLANDER
 	bool "Highlander"
 	depends on CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785