riscv: starfive: MMC card detect

The VisionFive 2 board uses GPIO 41 as card detect as documented in
https://doc-en.rvspace.org/VisionFive2/PDF/SCH_RV002_V1.2A_20221216.pdf.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Acked-by: Minda Chen <minda.chen@starfivetech.com>
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