mt76: mt7615: Fix fall-through warnings for Clang

stable inclusion
from stable-v5.10.190
commit 37fad83ae5276b007b9e36456be68b80c9649d57
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I928UI

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=37fad83ae5276b007b9e36456be68b80c9649d57

--------------------------------

[ Upstream commit f12758f6 ]

In preparation to enable -Wimplicit-fallthrough for Clang, fix a
warning by replacing a /* fall through */ comment with the new
pseudo-keyword macro fallthrough; instead of letting the code fall
through to the next case.

Notice that Clang doesn't recognize /* fall through */ comments as
implicit fall-through markings.

Link: https://github.com/KSPP/linux/issues/115


Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Stable-dep-of: 421033de ("wifi: mt76: mt7615: do not advertise 5 GHz on first phy of MT7615D (DBDC)")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>