Originally VLS used hsmd_ready_channel as an early call during channel
setup, but later the BOLT-2 spec changed the name of funding_locked to channel_ready.
This is very confusing because the hsmd_ready_channel is not directly
related to the new channel_ready.
This commit is renaming the hsmd_ready_channel to hsmd_setup_channel.
Link: https://github.com/ElementsProject/lightning/issues/6717
Suggested-by: Ken Sedgwick
Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>