core: move simple utils function from "nm-platform-utils.h"
Most functions defined in "nm-platform-utils.h" perform a lookup of link properties, for example via ethtool or sysfs. Those functions depend on the system configuration, such as the current network namespace. Move the simple helper functions away to "nm-core-internal.h", so that all remaining functions from "nm-platform-utils.h" are really related to somthing that interacts with the system/kernel.
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