ARM: vexpress/TC2: Match mainline cache disabling sequence in tc2_pm_down

When the TC2 pm code was finally upstreamed [1] the cache disbling sequence
had been modified to avoid some potential race conditions. So lets backport
these changes.

[1] Commit 11b277eabe70 ARM: vexpress/TC2: basic PM support

Signed-off-by: Jon Medhurst <tixy@linaro.org>
1 file changed