python/qemu: accel: Fix kvm_available() on ppc64le

python/qemu: accel: Fix kvm_available() on ppc64le

On ppc64le, the accel.kvm_available() check may wrongly
return False because the host arch (as returned by os.uname[4])
and the target arch (ppc64) mismatch. In order to solve this
it is added an ppc64le -> ppc64 mapping which is used as an
fallback verification.

Fixes: 53a049d7d78e5ccf6d4c0d7
Signed-off-by: Wainer dos Santos Moschetta <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Message-Id: <20200205203250[email protected]>
Signed-off-by: Philippe Mathieu-Daudé <[email protected]>