Revert "net: ethernet: ti: am65-cpsw: Add suspend/resume support"

This reverts commit fd23df72

.

This commit broke set channel operation. Revert this and
implement it with a different approach in a separate patch.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>