[nrf fromtree] drivers: timer: nrf_grtc_timer: fix last_count initialization#3009

adamkondraciuk wants to merge 2 commits intonrfconnect:mainnrfconnect/sdk-zephyr:mainfrom

adamkondraciuk:NRFX-NONE-fix-last-count-init-for-grtcadamkondraciuk/sdk-zephyr:NRFX-NONE-fix-last-count-init-for-grtcCopy head branch name to clipboard