arm64: ARM: dts: exynos: Remove double SD card detect pin inversion on TM2

MMC host controller bindings and MMC core defines card detect pin as
active low.  Therefore there is no point to invert it twice.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>