[PATCH][next] clk: imx: Use fallthrough pseudo-keyword

[Stephen Boyd]

Quoting Gustavo A. R. Silva (2020-07-27 13:09:22)
> Replace the existing /* fall through */ comments and its variants with
> the new pseudo-keyword macro fallthrough[1].
> 
> [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through
> 
> Signed-off-by: Gustavo A. R. Silva <gustavoars at kernel.org>
> ---

Applied to clk-next