ARM64: dts: meson-gxbb-odroidc2: Fix TFLASH VDD regulator GPIO line

The wrong GPIO line was provided here.

Fixes: ef8d2ffe ("ARM64: dts: meson-gxbb: add MMC support")
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>