mmc: omap: fix broken slot switch lookup

mmc: omap: fix broken slot switch lookup

The lookup is done before host->dev is initialized. It will always just
fail silently, and the MMC behaviour is totally unpredictable as the switch
is left in an undefined state. Fix that.

Fixes: e519f0bb64ef ("ARM/mmc: Convert old mmci-omap to GPIO descriptors")
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Message-ID: <20240223181439.1099750-4-aaro.koskinen@iki.fi>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>