drivers: uart_mcux_flexcomm: fix dma rx config

[remdzi]

The DMA configurations for TX and RX were mixed-up letting the DMA RX channel not fully configured.

This fix correctly configures the DMA RX channel with DMA_ADDR_ADJ_NO_CHANGE.

Related to issue #97289

Fixes: #97289

[github-actions]

Hello @remdzi, and thank you very much for your first pull request to the Zephyr project!
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[mjchen0]

I concur this was a typo bug in my CL and the fix looks correct.

[mmahadevan108]

@remdzi , thanks for your contribution. Please fix the commit message, link to guidelines:
https://docs.zephyrproject.org/latest/contribute/guidelines.html#commit-message-guidelines

[sonarqubecloud]

Please retry analysis of this Pull-Request directly on SonarQube Cloud

[github-actions]

Hi @remdzi!
Congratulations on getting your very first Zephyr pull request merged 🎉🥳. This is a fantastic achievement, and we're thrilled to have you as part of our community!

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Thank you for your valuable input, and we look forward to seeing more of your contributions in the future! 🪁