ARM: 64-bit defconfig updates for v4.5

As mentioned earlier, we usually bake this into the general "arm64" branch,
but this release we have partitioned up the updates a bit more.

Most of these updates are enabling new SoCs in the single defconfig for 64-bit,
Renesas R8A7795, a number of Tegra options, Socionext Uniphier and a handful
of new options for other platforms as well.
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