ARM: mvebu: Disable CPU Idle on Armada 38x

ARM: mvebu: Disable CPU Idle on Armada 38x

[ Upstream commit 548ae94c1cc7fc120848757249b9a542b1080ffb ]

On Armada 38x SoCs, under heavy I/O load, the system hangs when CPU
Idle is enabled. Waiting for a solution to this issue, this patch
disables the CPU Idle support for this SoC.

As CPU Hot plug support also uses some of the CPU Idle functions it is
also affected by the same issue. This patch disables it also for the
Armada 38x SoCs.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: <stable@vger.kernel.org> # v3.17 +
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>