arm64: dts: exynos: exynos7885-jackpotlte: Correct RAM amount to 4GB

arm64: dts: exynos: exynos7885-jackpotlte: Correct RAM amount to 4GB

All known jackpotlte variants have 4GB of RAM, let's use it all.
RAM was set to 3GB from a mistake in the vendor provided DTS file.

Fixes: 06874015327b ("arm64: dts: exynos: Add initial device tree support for Exynos7885 SoC")
Signed-off-by: David Virag <virag.david003@gmail.com>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Link: https://lore.kernel.org/r/20240713180607.147942-3-virag.david003@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>