Add support for TI PMIC TPS6594 onto j784s4 EVM board

Ghost Userrequested to merge
jneanne/tps6594-j784s4 into integ/tps6594

Most of j784s4 board files are exected to come fro TI soon.

Only PMIC specific dt modification should be kept in the end.

This allow testing until j784s4 is officially supported

Signed-off-by: Jerome Neanne jneanne@baylibre.com

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