arm64: dts: amlogic: t7: add the pipeline clock to the MMC controllers

The SD/eMMC controllers reach the DRAM through a pipeline stage that
the hardware design inserts in the bus path to the NIC_MATRIX fabric,
clocked by CLKID_SYS_AMPIPE_NAND. When that clock is disabled, a
controller that starts a DMA transfer can never complete it.

Reference the clock from the three MMC controller nodes so the driver
keeps it running, instead of relying on the clock being marked critical
in the clock controller.

Assisted-by: Claude:claude-fable-5
Signed-off-by: Lucas Tanure <tanure@linux.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20260905153234.133217-4-tanure@linux.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

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