HID: hyperv: Use in-place iterator API in the channel callback

HID: hyperv: Use in-place iterator API in the channel callback

BugLink: https://bugs.launchpad.net/bugs/1852492
[ Upstream commit 6a297c90efa68b2864483193b8bfb0d19478600c ]

Simplify the ring buffer handling with the in-place API.

Also avoid the dynamic allocation and the memory leak in the channel
callback function.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>