sm8350-common: init: Avoid migrating foreground tasks to X1

The Cortex-X1 core is quite power hungry. Let's only use it for
top-app tasks. Avoid migrating foreground tasks to X1 to reduce
unnecessary bumps of X1's frequency and save some battery.

Change-Id: I8bb7655010da98c083560d647d5c682cd636cc82
Signed-off-by: Chenyang Zhong <zhongcy95@gmail.com>
Signed-off-by: Vaisakh Murali <mvaisakh@statixos.com>
Signed-off-by: chandu078 <chandudyavanapelli03@gmail.com>