arm64: dts: amlogic: a1: align the mmc clock setup

arm64: dts: amlogic: a1: align the mmc clock setup

The amlogic MMC driver operate with the assumption that MMC clock
is configured to provide 24MHz. It uses this path for low
rates such as 400kHz.

A1 is particular in the way that is already has the mmc clock set
to 24MHz by forcing the mux to select the board crystal. It works
too, it is just slightly less readable.

Align with what is being done with the other Amlogic platforms.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20260114-amlogic-mmc-clocks-followup-v1-2-a999fafbe0aa@baylibre.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>