ASoC; dt-bindings: mediatek,mt8173-rt5650-rt5514: Fix mediatek,audio-codec constraints

ASoC; dt-bindings: mediatek,mt8173-rt5650-rt5514: Fix mediatek,audio-codec constraints

A phandle-array is really a matrix and needs constraints on the number
of elements for both the inner and outer dimensions. Add the missing
inner constraints.

Fixes: 472d77bdc511 ("ASoC: dt-bindings: mediatek,mt8173-rt5650-rt5514: convert to DT schema")
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260508182438.1757394-1-robh@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>