target/hppa: Update SeaBIOS-hppa

Update to lastest SeaBIOS-hppa which sets up the
LMMIO range for the internal artist graphic card.

Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/roms/seabios-hppa b/roms/seabios-hppa
index 1c516b481339f511d83a4afba9a48d1ac904e93e..3391c580960febcb9fa8f686f9666adaa462c349 160000 (submodule)
--- a/roms/seabios-hppa
+++ b/roms/seabios-hppa
@@ -1 +1 @@
-Subproject commit 1c516b481339f511d83a4afba9a48d1ac904e93e
+Subproject commit 3391c580960febcb9fa8f686f9666adaa462c349