riscv: Allow to enable PREEMPT_RT.
arm64: Allow to enable PREEMPT_RT.
x86: Allow to enable PREEMPT_RT.
x86/tsc: Check for sockets instead of CPUs to make code match comment
clockevents/drivers/i8253: Fix stop sequence for timer 0
x86/i8253: Disable PIT timer 0 when not in use
x86/tsc: Use topology_max_packages() to get package number
x86/amd_nb: Add new PCI IDs for AMD family 1Ah model 60h-70h