DscpPolicy Move to kernel 5.15

Require at least kernel 5.15. Feature is not required on older
kernels and may impact boot time unnecessarily.

Bug: 235559605
Change-Id: I2e4b509de1d8940fc63ae057a8326f13c0fd1420
(cherry picked from commit a8ca597aec0e5d288a00133b44a1509075b90d21)
Merged-In: I2e4b509de1d8940fc63ae057a8326f13c0fd1420
2 files changed