roms: re-remove execute bit from hppa-firmware*

roms: re-remove execute bit from hppa-firmware*

This was fixed in c9d77526bddba0803a1fa982fb59ec98057150f9 for
9.2.0 but regressed in db34be329162cf6b06192703065e6c1010dbe3c5 in
10.0.0

When the bit is present, rpmbuild complains about missing ELF build-id

Signed-off-by: Cole Robinson <crobinso@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Acked-by: Helge Deller <deller@gmx.de>
Message-ID: <52d0edfbb9b2f63a866f0065a721f3a95da6f8ba.1747590860.git.crobinso@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
(cherry picked from commit a598090ebaeb930ce33c2df0d80d87da13be8848)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>