cpufreq: interactive: fix deadlock on spinlock in timer

Need to use irqsave/restore spinlock calls to avoid a deadlock in calls
from the timer.

Change-Id: I15b6b590045ba1447e34ca7b5ff342723e53a605
Signed-off-by: Todd Poynor <toddpoynor@google.com>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
auto_hotplug.c: increase the threshold for onlining all cores at the same time.

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
auto_hotplug.c: these are variables that are only read from, so optimise it.

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
auto_hotplug.c: this device boots up faster than any other so we can start the hotplug works sooner - sometimes the previous 20 seconds timer started exactly when I started to swipe the App Drawer after the device was booted and that would create a 1 time lag and that was annoying every time I rebooted. Should be ok now.

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
binfmt_elf.c: use get_random_int() to fix entropy depleting. Original commit: https://patchwork.kernel.org/patch/1745611/

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>