arm64: dts: meson-gxl-s905x-khadas-vim: Fix Wifi node name

bcrmf -> brcmf -> wifi

Fixes: e15d2774 ("ARM64: dts: meson-gxl: add support for the Khadas VIM board")
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>