clk: lmk04832: drop redundant fallthrough statements

When the body of a case statement is empty, it is well understood that
it is intentional and explicit fallthrough statements are not required.
Drop them.

Signed-off-by: Liam Beguin <liambeguin@gmail.com>
Link: https://lore.kernel.org/r/20210708211645.3621902-1-liambeguin@gmail.com


Signed-off-by: Stephen Boyd <sboyd@kernel.org>