arm64: dts: exynos: disable non-working GPU on Exynos7 Espresso

The Panfrost GPU drivers require clock but such was not provided in
Exynos7 DTSI.  The CMU_G3D clock controller was not upstreamed, thus
consider GPU as non-working and simply disable it to silence warnings
like:

  exynos7-espresso.dtb: gpu@14ac0000: 'clocks' is a required property

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Alim Akhtar <[email protected]>

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