When generating config with 'make defconfig kselftest-merge' fragment
CONFIG_TEST_LIVEPATCH=m isn't set.

Rework to enable CONFIG_LIVEPATCH and CONFIG_DYNAMIC_DEBUG as well.
Signed-off-by: NAnders Roxell <anders.roxell@linaro.org>
Signed-off-by: NShuah Khan <skhan@linuxfoundation.org>