[PATCH -next] hv: vmbus: Constify struct kobj_type and struct attribute_group

[Hongbo Li <lihongbo22@xxxxxxxxxx>]

The `struct attribute_group` and `struct kobj_type` are not
modified, and they are only used in the helpers which take a
const type parameter.

Constifying these structure and moving them to a read-only section,
and this can increase over all security.

```
[Before]
   text   data    bss    dec    hex    filename
  20568   4699     48  25315   62e3    drivers/hv/vmbus_drv.o

[After]
   text   data    bss    dec    hex    filename
  20696   4571     48  25315   62e3    drivers/hv/vmbus_drv.o
```

Signed-off-by: Hongbo Li <lihongbo22@xxxxxxxxxx>
---
 drivers/hv/vmbus_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 7242c4920427..71fd8b97df33 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1831,12 +1831,12 @@ static umode_t vmbus_chan_attr_is_visible(struct kobject *kobj,
 	return attr->mode;
 }
 
-static struct attribute_group vmbus_chan_group = {
+static const struct attribute_group vmbus_chan_group = {
 	.attrs = vmbus_chan_attrs,
 	.is_visible = vmbus_chan_attr_is_visible
 };
 
-static struct kobj_type vmbus_chan_ktype = {
+static const struct kobj_type vmbus_chan_ktype = {
 	.sysfs_ops = &vmbus_chan_sysfs_ops,
 	.release = vmbus_chan_release,
 };
-- 
2.34.1