sm8250-common: Introduce a stub kona-post-boot script

This will be used to tune some parameters in the device. Only run
this script after proprietary kernel post-boot has run, so that
these changes are not overriden by the same.

Change-Id: Ibcef27a2813870c62d54c9d762eae9e03da677ad
Signed-off-by: Vaisakh Murali <mvaisakh@statixos.com>
Signed-off-by: chandu078 <chandudyavanapelli03@gmail.com>