zephyr: nrf_wifi: Update RPU patch to rev#e2b91b4ff86b#1896

rlubos merged 1 commit intonrfconnect:mainnrfconnect/sdk-nrfxlib:mainfrom

karun2796:wpspbc_nrfxlibkarun2796/sdk-nrfxlib:wpspbc_nrfxlibCopy head branch name to clipboard