target/hppa: Update to SeaBIOS-hppa from version 10 to 12

SEABIOS_HPPA_VERSION 12 contains those fixes and enhancements:
    - Reduce debug level
    - Update README file for PA-RISC
    - Fix debug name of CPU_HPA_xx if xx >= 10
    - Disable device indexing

SEABIOS_HPPA_VERSION 11 contains those fixes and enhancements
(mostly to enable support for 64-bit Linux kernel):
    - Fixed 64-bit CPU detection via "mfctl,w" instruction
    - Implement PDC_PSW for 64-bit CPUs
    - Added PAT PDC functions:
        - PDC_PAT_CELL
        - PDC_PAT_CHASSIS_LOG
        - PDC_PAT_PD_GET_ADDR_MAP
        - PDC_PAT_CPU
    - Fix return value of PDC_CACHE_RET_SPID space-id bits
    - Introduce new default software IDs for the machines
    - Fix CPU and FPU model numbers
    - Fix 64-bit SMP rendezvous
    - Fix Linux 64-bit kernel crash in STI due to usage of unsigned
      32-bit "next_font" pointer in sti header files
    - Fix graphics output to LASI artist card on PA2.0 machines
    - More USB OHCI endianess fixes
    - Fixes which make ODE run on B160L
    - Fixes which make ODE detect Astro Runway port and CPUs
    - Implement "firmware unlocking" via PDC_MODEL/PDC_MODEL_CAPABILITIES call
    - Add subfunction 2 for PDC_MODEL_VERSIONS

Signed-off-by: Helge Deller <deller@gmx.de>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>