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NALLINO kernel DTS: raise VDD_SOC-voltages

Jonas Höppner requested to merge fix-imx6ull-vddsoc-voltages into linux-5.10.32-guf

With the 4.9.88 kernel we've seen, that NXP's default VDD_SOC-voltages cause sporadic PLL stability issues resulting in random crashes and hangs (especially when spread-spectrum clocking is enabled).

We therefore raise the VDD_SOC-voltages to values determined to be safe for all operating points.

BCS 745-000393

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