pc-bios: Add hppa-firmware.img and git submodule

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/.gitmodules b/.gitmodules
index 1500579..7a8282d 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -40,3 +40,6 @@
 [submodule "capstone"]
 	path = capstone
 	url = git://git.qemu.org/capstone.git
+[submodule "roms/seabios-hppa"]
+	path = roms/seabios-hppa
+	url = git://github.com/hdeller/seabios-hppa.git