arm64: Use the reserved TTBR0 if context switching to the init_mm

The idle_task_exit() function may call switch_mm() with next ==
&init_mm. On arm64, init_mm.pgd cannot be used for user mappings, so
this patch simply sets the reserved TTBR0.

Change-Id: I90c16bcb0edcdcf6e1ce9f98a091ad1e0cccb697
Cc: <stable@vger.kernel.org>
Reported-by: Jon Medhurst (Tixy) <tixy@linaro.org>
Tested-by: Jon Medhurst (Tixy) <tixy@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Git-commit: e53f21bce4d35a93b23d8fa1a840860f6c74f59e
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>