tcp: add a sysctl to config the tcp_default_init_rwnd

The default initial rwnd is hardcoded to 10.

Now we allow it to be controlled via
  /proc/sys/net/ipv4/tcp_default_init_rwnd
which limits the values from 3 to 100

This is somewhat needed because ipv6 routes are
autoconfigured by the kernel.

See "An Argument for Increasing TCP's Initial Congestion Window"
in https://developers.google.com/speed/articles/tcp_initcwnd_paper.pdf

Signed-off-by: JP Abgrall <jpa@google.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm: Remove write permissions for "select_image"

This way we will cover the CTS requirements for
testAllFilesInSysAreNotWritable, e.g. only G/O to have write permissions
in /sys/ folder.

Signed-off-by: Yulian Shandorov <jshandorov@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
drivers: cpufreq: Ondemand gov cleanup

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>