kernel: Remove unused timeout_q from z_kernel

This commit removes the `timeout_q` from the `struct z_kernel` since it
is no longer used.

Note that the new kernel timeout implementation introduced in the
commit 987c0e5fc1fa665ce629796c97529f219380e0a7 uses `timeout_list`
global variable in place of it.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
2 files changed