Revert "make: Don't update submodules recursively"

This reverts commit 85eda945ae6747922f9613e64029fc55eb887efe.
Don't spam brew updates, it's heavy

Signed-off-by: Carl Helmertz <chelmertz@op5.com>
make: Trigger submodule init && update when initiating

They won't hurt when updating either.

Signed-off-by: Carl Helmertz <chelmertz@op5.com>
make: Let comments be reminder of what to do manually

Signed-off-by: Carl Helmertz <chelmertz@op5.com>