mmc: brcmstb: don't squash card-busy detection on bcm2712
Commit 485d9421 ("mmc: sdhci-brcmstb: check R1_STATUS for erase/trim/discard") introduced a new flag and defaulted to disabling card busy detection across all platforms with this controller. This is required for IO voltage switching, as the card drives CMD low while the switch is in progress. Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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