[Backport v3.7.99-ncs3-branch] [nrf fromtree] tests: drivers: uart: async_api: Add nrf54h20 cpuppr and UARTE120 test#2418

bjarki-andreasen merged 1 commit intov3.7.99-ncs3-branchnrfconnect/sdk-zephyr:v3.7.99-ncs3-branchfrom

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