ARM: dts: clearfog: fix sdhci supply property name

[ Upstream commit e807f0298144c06740022a2f900d86b7f115595e ]

The vmmc phandle, like all power supply property names, must have the
'-supply' suffix.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>