Add kfuncs bpf_strcasestr and bpf_strncasestr#6105

kernel-patches-daemon-bpf-rc[bot] wants to merge 2 commits intobpf-next_basekernel-patches/bpf-rc:bpf-next_basefrom

series/1008873=>bpf-nextkernel-patches/bpf-rc:series/1008873=>bpf-nextCopy head branch name to clipboard