ASoC: fsl: fsl_audmix: Validate written enum values

fsl_audmix_put_mix_clk_src() and fsl_audmix_put_out_src()
convert the user-provided enum item with snd_soc_enum_item_to_val()
before checking whether the item is within the enum's item count.

The generic snd_soc_put_enum_double() helper performs that
validation, but these callbacks use the converted value first: the
clock-source path tests it with BIT(), and the output-source path
indexes the prms transition table with it.

Reject out-of-range enum items before converting them.

Fixes: be1df61cf06e ("ASoC: fsl: Add Audio Mixer CPU DAI driver")
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: HyeongJun An <sammiee5311@gmail.com>
Link: https://patch.msgid.link/20260609124317.38046-4-sammiee5311@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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