Remove unused cutils/atomic.h includes, add "std"

Add a missing "std::" prefix to memory_order_* enumerators.

cutils/atomic.h is deprecated, and these files don't use any of the
header's identifiers.

Bug: 147765083
Test: m MODULES-IN-frameworks-base
Flag: EXEMPT refactor
Change-Id: I9e38624a134676cb18d443ae704bbfe37a238b24