arm64: dts: mediatek: mt2712e: Update the name of property 'clk_csr'

Update the name of property 'clk_csr' as 'snps,clk-csr' to align with
the property name in the binding file.

Signed-off-by: Jianguo Zhang <jianguo.zhang@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: David S. Miller <davem@davemloft.net>