include/crypto: Include qapi-types.h or qemu/bswap.h instead of qemu-common.h

qemu-common.h should only be included by .c files.  Its file comment
explains why: "No header file should depend on qemu-common.h, as this
would easily lead to circular header dependencies."

Several include/crypto/ headers include qemu-common.h, but either need
just qapi-types.h from it, or qemu/bswap.h, or nothing at all.  Replace or
drop the include accordingly.  tests/test-crypto-secret.c now misses
qemu/module.h, so include it there.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/crypto/ivgen-plain64.c b/crypto/ivgen-plain64.c
index 94d8673..6c6b1b4 100644
--- a/crypto/ivgen-plain64.c
+++ b/crypto/ivgen-plain64.c
@@ -20,6 +20,7 @@
 
 #include "qemu/osdep.h"
 #include "qapi/error.h"
+#include "qemu/bswap.h"
 #include "crypto/ivgen-plain.h"
 
 static int qcrypto_ivgen_plain_init(QCryptoIVGen *ivgen,