create_build_jobs: Enable X86_GENERIC for i386 kernel pvops jobs.

create_build_jobs: Enable X86_GENERIC for i386 kernel pvops jobs.

This is following a failure to build "arch/x86/xen/enlighten.c" in
build-i386-pvops jobs with linux 968f35f4ab1c ("Merge tag
'v6.7-rc3-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6")
in linux-linus branch.

Today the cpu type for a 32-bit x86 kernel is not specified in the
used kernel config, resulting in the M686 to be used.

Instead of using the M686 which isn't even a 64-bit cpu (thus not
capable to run a Xen guest), use the X86_GENERIC variant which is
more appropriate.

Suggested-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>