In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.

This patch fixes the following warnings:

drivers/clk/imx/clk-pllv3.c: In function ‘imx_clk_pllv3’:
drivers/clk/imx/clk-pllv3.c:446:18: warning: this statement may fall through 
[-Wimplicit-fallthrough=]
   pll->div_shift = 1;
   ~~~~~~~~~~~~~~~^~~
drivers/clk/imx/clk-pllv3.c:447:2: note: here
  case IMX_PLLV3_USB:
  ^~~~
drivers/clk/imx/clk-pllv3.c:453:21: warning: this statement may fall through 
[-Wimplicit-fallthrough=]
   pll->denom_offset = PLL_IMX7_DENOM_OFFSET;
                     ^
drivers/clk/imx/clk-pllv3.c:454:2: note: here
  case IMX_PLLV3_AV:
  ^~~~

Warning level 3 was used: -Wimplicit-fallthrough=3

This patch is part of the ongoing efforts to enable
-Wimplicit-fallthrough.

Signed-off-by: Gustavo A. R. Silva <[email protected]>
---
 drivers/clk/imx/clk-pllv3.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/clk/imx/clk-pllv3.c b/drivers/clk/imx/clk-pllv3.c
index e892b9a836e5..4110e713d259 100644
--- a/drivers/clk/imx/clk-pllv3.c
+++ b/drivers/clk/imx/clk-pllv3.c
@@ -444,6 +444,7 @@ struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const 
char *name,
                break;
        case IMX_PLLV3_USB_VF610:
                pll->div_shift = 1;
+               /* fall through */
        case IMX_PLLV3_USB:
                ops = &clk_pllv3_ops;
                pll->powerup_set = true;
@@ -451,6 +452,7 @@ struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const 
char *name,
        case IMX_PLLV3_AV_IMX7:
                pll->num_offset = PLL_IMX7_NUM_OFFSET;
                pll->denom_offset = PLL_IMX7_DENOM_OFFSET;
+               /* fall through */
        case IMX_PLLV3_AV:
                ops = &clk_pllv3_av_ops;
                break;
-- 
2.21.0

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