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[E39] Change imx atf debug uart to lpuart5

Christos requested to merge chka-change-atf-output-port into scarthgap

This MR adds a patch to change the uart port used by ATF from its default port to lpuart5, which maps to serial port #0 on the modular vision board.

These changes have to be applied in pair with the u-boot changes which change u-boot's output to the same serial port. There are issues with clock initializations if these MRs are not merged together. The u-boot MR in question is clea-os/bsp/nxp/u-boot-seco-imx!176 (merged).

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