metag: minimal TZ1090 (Comet) SoC infrastructure

Add really minimal support for Toumaz Xenif TZ1090 SoC (A.K.A. Comet).
This consists of minimal build infrastructure, device tree files, and a
defconfig based on meta2_defconfig.

This SoC contains a 2-threaded HTP (Meta 2) as the main application
processor, and is found in a number of development boards and digital
radios, such as the Minimorph Development Platform.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Rob Landley <rob@landley.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-doc@vger.kernel.org
Cc: devicetree-discuss@lists.ozlabs.org
diff --git a/arch/metag/Kconfig.soc b/arch/metag/Kconfig.soc
index ec079cf..653b479 100644
--- a/arch/metag/Kconfig.soc
+++ b/arch/metag/Kconfig.soc
@@ -14,6 +14,15 @@
 	help
 	  This is a Meta 2.1 FPGA bitstream, just a bare CPU.
 
+config SOC_TZ1090
+	bool "Toumaz Xenif TZ1090 SoC (Comet)"
+	select METAG_LNKGET_AROUND_CACHE
+	select METAG_META21
+	select METAG_SMP_WRITE_REORDERING
+	help
+	  This is a Toumaz Technology Xenif TZ1090 (A.K.A. Comet) SoC containing
+	  a 2-threaded HTP.
+
 endchoice
 
 menu "SoC configuration"