rcutorture: Add v3.12 version, which adds sysidle testing

The v3.12 version of the kernel added the CONFIG_NO_HZ_FULL_SYSIDLE
Kconfig parameter, so this commit adds a version transition at that
point.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Greg KH <gregkh@linuxfoundation.org>

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/CFLIST
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/N1-S-T-NH-SD-SMP-HP
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/N2-2-t-nh-sd-SMP-hp
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/N3-3-T-nh-SD-SMP-hp
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/N4-A-t-NH-sd-SMP-HP
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/N5-U-T-NH-sd-SMP-hp
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/N6---t-nh-SD-smp-hp
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/N7-4-T-NH-SD-SMP-HP
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/N8-2-T-NH-SD-SMP-HP
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/NT1-nh
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/NT3-NH
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/P1-S-T-NH-SD-SMP-HP
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/P2-2-t-nh-sd-SMP-hp
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/P3-3-T-nh-SD-SMP-hp
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/P4-A-t-NH-sd-SMP-HP
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/P5-U-T-NH-sd-SMP-hp
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/P6---t-nh-SD-smp-hp
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/P7-4-T-NH-SD-SMP-HP
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/P7-4-T-NH-SD-SMP-HP-all
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/P7-4-T-NH-SD-SMP-HP-none
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/P7-4-T-NH-SD-SMP-hp
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/PT1-nh
Simple merge

diff --cc tools/testing/selftests/rcutorture/configs/v3.12/PT2-NH
Simple merge