Revert "asm-generic: relaxed.h: defined relaxed.h"

This reverts commit a957bcaa10d33eefa6922f11d2c95e5a88731621.
Revert "arm: asm: relaxed.h: defined relaxed.h"

This reverts commit 9b544328a015b3ecfd99c32f46a356ab8e1d9362.
Revert "sched: defining relaxed version of idle_cpu"

This reverts commit 607140527754be2f790f30a5c20a2f20316bdd16.
Revert "sched: Trying to reduce power usage"

This reverts commit 6b932158815f9f77e4d1712b7e45fed67c34d72b.