kselftest: test changes related to 4.20 merge

The 4.20 kselftest merge requires a few test configuration changes.

The rtctest change has moved within the kselftest tree.

Due to efivarfs and psock_tpacket now returning a kselftest skip code,
and current limitations of the VTS kselftest harness, these tests need
to be temporarily disabled.

Bug: 79702574
Test: run vts-kernel -m VtsKernelLinuxKselftest
Change-Id: Ie5a9d6b3a3a45a44e28c3b5466c1f55fdeb1b929
1 file changed