[UnitTest] Enable TEST_COVERAGE flags with kconfig
[UnitTest] Enable TEST_COVERAGE flags with kconfig

Resolves: LE-11966
Change-Id: I049a99d6f04c2681ba8573b39060328e643b8cb8

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af