Include qemu/module.h where needed, drop it from qemu-common.h

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20190523143508.25387-4-armbru@redhat.com>
[Rebased with conflicts resolved automatically, except for
hw/usb/dev-hub.c hw/misc/exynos4210_rng.c hw/misc/bcm2835_rng.c
hw/misc/aspeed_scu.c hw/display/virtio-vga.c hw/arm/stm32f205_soc.c;
ui/cocoa.m fixed up]
diff --git a/block/iscsi.c b/block/iscsi.c
index f31c612..cf9d66c 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -36,6 +36,7 @@
 #include "block/qdict.h"
 #include "scsi/constants.h"
 #include "qemu/iov.h"
+#include "qemu/module.h"
 #include "qemu/option.h"
 #include "qemu/uuid.h"
 #include "qapi/error.h"