mvebu: gl-mv1000: fix sdhci1 controller

mvebu: gl-mv1000: fix sdhci1 controller

GL-MV1000 external SD controller was broken by a recent kernel update
between OpenWRT releases 24.10.2 and 24.10.3 due to a mistake in Device
Tree: "regulator-gpio" was defined without required "gpios" property.

Since "no-1-8-v" property is also defined for this controller
a switchable vqmmc-supply regulator performs no function - a fixed 3.3V
IO voltage will always be used.

This regulator definition was probably added by mistake from a Device
Tree from another device.

Remove incomplete vcc_sd_reg1 regulator definition to fix this issue.

Issue discussion for reference: openwrt/openwrt#20309

Upstream commit: 6f2325b23d2cfa28099c26c299ae774625f1872b
Signed-off-by: Mikhail Zadorozhnyi <zador.blood.stained+git@protonmail.com>
Link: https://github.com/openwrt/openwrt/pull/20378
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>