qemu: move qemuDomainValidateDef() to qemu_validate.c

Move the static functions qemuDomainValidateDef() uses, as well as
qemuDomainValidateDef() itself to qemu_validate.
Signed-off-by: NDaniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_validate.h

@@ -25,5 +25,4 @@
 #include "domain_conf.h"
 #include "qemu_capabilities.h"
 
-int qemuValidateDomainDefFeatures(const virDomainDef *def,
-                                  virQEMUCapsPtr qemuCaps);
+int qemuValidateDomainDef(const virDomainDef *def, void *opaque);