LOCAL / clocksource: arm_arch_timer: Don't register clockevent for Per-CPU

LOCAL / clocksource: arm_arch_timer: Don't register clockevent for Per-CPU

The arm64 architecture enabled the arm_arch_timer always
even if arm_arch_timer is not stable. When Exynos5433 uses the
arm_arch_timer, it fails to enable/disble the secondary cpu.

To fix the hotplug issue of secondary cpu, if Exynos's MCT timer
is enabled, arm_arch_timer doesn't register the clockevent for Per-CPU.

Change-Id: Ia41f9c13889c4637391168dbc828a0bdbc7cdfff
Reported-by: Wook Song <wook16.song@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>