arm64: dts: meson-gxl: jethub-j80: Fix WiFi MAC address node

arm64: dts: meson-gxl: jethub-j80: Fix WiFi MAC address node

Unit addresses should be written using lower-case hex characters. Use
wifi_mac@c to fix a yaml schema validation error once the eFuse
dt-bindings have been converted to a yaml schema:
  efuse: Unevaluated properties are not allowed ('wifi_mac@C' was
  unexpected)

Also node names should use hyphens instead of underscores as the latter
can also cause warnings.

Fixes: abfaae24ecf3 ("arm64: dts: meson-gxl: add support for JetHub H1")
Acked-by: Vyacheslav Bocharov <adeep@lexina.in>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20230111211350.1461860-2-martin.blumenstingl@googlemail.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>