Merge remote-tracking branch 'remotes/rth/tags/pull-hppa-20180407' into staging

Update hppa-softmmu bios

# gpg: Signature made Fri 06 Apr 2018 14:15:31 BST
# gpg:                using RSA key 64DF38E8AF7E215F
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>"
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth/tags/pull-hppa-20180407:
  Update seabios-hppa
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

seabios-hppa @ 1ef99a01

-Subproject commit 649e6202b8d65d46c69f542b1380f840fbe8ab13
+Subproject commit 1ef99a01572c2581c30e16e6fe69e9ea2ef92ce0