Remove FrameworkCoreTests_*

The FrameworkCoreTests_* modules are helper apps that get
embedded into FrameworksCoreTests, they don't need to be tested
on their own.

Also remove duplicate FrameworksCoreTests.

Test: no warnings from platform_test_list.mk
Change-Id: Ie1df03b570e20b0da2c376e3faca4fc0a1d85902