firmware: arm_scmi: Remove __exit annotation

virtio_scmi_exit() is only called from __exit function, so the annotation
is correct, but when the driver is built-in, the section gets discarded
and the reference from a callback pointer causes a link-time error:

`virtio_scmi_exit' referenced in section `.rodata' of drivers/firmware/arm_scmi/virtio.o:
	defined in discarded section `.exit.text' of drivers/firmware/arm_scmi/virtio.o

I could not figure out a better workaround, so let's just remove that
annotation even if it wastes a couple of bytes in .text.

Link: https://lore.kernel.org/r/[email protected]
Fixes: 46abe13 ("firmware: arm_scmi: Add virtio transport")
Signed-off-by: Arnd Bergmann <[email protected]>
Signed-off-by: Sudeep Holla <[email protected]>

Author: arndb

drivers/firmware/arm_scmi/virtio.c

@@ -476,7 +476,7 @@ static int __init virtio_scmi_init(void)
 	return register_virtio_driver(&virtio_scmi_driver);
 }
 
-static void __exit virtio_scmi_exit(void)
+static void virtio_scmi_exit(void)
 {
 	unregister_virtio_driver(&virtio_scmi_driver);
 }