The gpio is actually low active, fix it.
Fixes: 40e7fab9e4 ("mediatek: add Nokia EA0326GMP support")
Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>
Link: https://github.com/openwrt/openwrt/pull/15651
Signed-off-by: Robert Marko <robimarko@gmail.com>