dt-bindings: clock: remove deprecated LSI AXM5516 clock bindings

commit  288d3aa837709a91646610e23a9e053ca315618a from
https://github.com/axxia/linux-yocto.git

 axxia-linux/v5.10/standard/axxia-dev/base

The clock definitions for Intel Axxia AXM55xx was simplified in
the device tree.
Only the peripheral clock frequency is needed and it is fixed.
The boot loader will determine the frequency and update
the device tree before booting Linux.

Remove deprecated LSI AXM5516 clock bindings.

Signed-off-by: John Jacques <john.jacques@intel.com>
Signed-off-by: Charlie Paul <charlie.paul@windriver.com>
Signed-off-by: Daniel Dragomir <Daniel.Dragomir@windriver.com>
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>