At the end, I achieved to expand the number of GPIO digital outputs for my android application. As I explained above, I followed various tips that I found on the forum (thanks @Terry), but the key one was (Unexportable GPIO pins on VIM3L - #13 by quatro) by @quatro. Commenting “pinctrl-0” line of tdmb device on /common/arch/arm64/boot/dts/amlogic/kvim3.dts file, it disabled I2S audios and allowed to export GPIOA_0 to GPIOA_4 pins.
I hope that can help other people with the same matter on the future.
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