configs: clearfog,helios4: disable sdhci sdma

configs: clearfog,helios4: disable sdhci sdma

Testing has shown that loading large initramfs causes data corruption
where the kernel image had been loaded to.
Debian 12 installation using a 17M initramfs boots fine, but the final
system with an initramfs of 27M obscurely fails to boot with bootz
reporting "Bad magic!".
Inspecting kernel_addr_r after this failed boot attempt does show
garbage in place of the expected zimage header.

The problem seems to occur on armada 388 only when sdhci sdma is enabled
in defconfig. Other armada boards such as turris omnia did not enable
the option.

Remove sdhci sdma from defconfig for now as a workaround.

Signed-off-by: Josua Mayer <josua@solid-run.com>
Reviewed-by: Stefan Roese <sr@denx.de>