[Backport v3.7.99-ncs1-branch] [nrf fromlist] tests: drivers: i2s: Add overlay to support nRF54L15 DK#2184

rlubos merged 1 commit intov3.7.99-ncs1-branchnrfconnect/sdk-zephyr:v3.7.99-ncs1-branchfrom

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