hrcon: Add support for the DH variant

hrcon DH(dual head) has two video outputs per FPGA.

Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc>
diff --git a/configs/hrcon_dh_defconfig b/configs/hrcon_dh_defconfig
new file mode 100644
index 0000000..a059dd9
--- /dev/null
+++ b/configs/hrcon_dh_defconfig
@@ -0,0 +1,5 @@
+CONFIG_SYS_EXTRA_OPTIONS="HRCON_DH"
+
+CONFIG_PPC=y
+CONFIG_MPC83xx=y
+CONFIG_TARGET_HRCON=y