vmx: Declare support for firmware autoselection

The feature was implemented in commits b4e34d1083 and
9bb6e4e739 but the corresponding feature flag was not set in
the driver, so other parts of of libvirt wouldn't be able to
know about it.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

src/vmx/vmx.c

@@ -638,6 +638,7 @@ static virDomainDefParserConfig virVMXDomainDefParserConfig = {
     .domainPostParseCallback = virVMXDomainDefPostParse,
     .features = (VIR_DOMAIN_DEF_FEATURE_WIDE_SCSI |
                  VIR_DOMAIN_DEF_FEATURE_NAME_SLASH |
+                 VIR_DOMAIN_DEF_FEATURE_FW_AUTOSELECT |
                  VIR_DOMAIN_DEF_FEATURE_NO_BOOT_ORDER),
     .defArch = VIR_ARCH_I686,
 };