arm-autonomy/linux-arm-autonomy: apply runstate fix to kernels older than 5.10

The patch introduced in 82ffc86b is a backport from the 5.10 version. Hence,
just apply it for kernels older than 5.10.

Change-Id: I6f442f540913b5e24bea533a436b4a3104d098e9
Issue-Id: SCM-2033
Signed-off-by: Diego Sueiro <diego.sueiro@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>