target/hppa: Update SeaBIOS-hppa to version 22

The new firmware includes support for an A400-44 machine
with initial functional 64-bit PAT PDC support:
- Linux 64-bit kernel runs nicely.
- ODE 2006 works nicely on 715, B160L, and A400, but has problems on C3700.
- MPE and 64-bit HP-UX11 need more work, although HP-UX11 boot up to a crash
  where it reports where it had problems.

Signed-off-by: Helge Deller <deller@gmx.de>
Reviewed-by: Anton Johansson <anjo@rev.ng>

roms/seabios-hppa

@@ -1 +1 @@
-Subproject commit b876684ec394856a8cc2523c57b3dc784dc119d4
+Subproject commit 1a8ada1fb70643172e251aacbac673c9ecda99e9