Update to v5.5 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.5

Test: Boots on walleye.
Test: Ran bionic-unit-tests on walleye.
Test: Boots on cuttlefish.
Test: Ran bionic-unit-tests on cuttlefish.
Change-Id: I57387d3c31e0ba5ad125ffe291cecf365c7b374e
Merged-In: I57387d3c31e0ba5ad125ffe291cecf365c7b374e
diff --git a/libc/kernel/uapi/linux/pkt_sched.h b/libc/kernel/uapi/linux/pkt_sched.h
index c287e8c..c965928 100644
--- a/libc/kernel/uapi/linux/pkt_sched.h
+++ b/libc/kernel/uapi/linux/pkt_sched.h
@@ -710,6 +710,7 @@
   TCA_PIE_BETA,
   TCA_PIE_ECN,
   TCA_PIE_BYTEMODE,
+  TCA_PIE_DQ_RATE_ESTIMATOR,
   __TCA_PIE_MAX
 };
 #define TCA_PIE_MAX (__TCA_PIE_MAX - 1)
@@ -717,6 +718,7 @@
   __u64 prob;
   __u32 delay;
   __u32 avg_dq_rate;
+  __u32 dq_rate_estimating;
   __u32 packets_in;
   __u32 dropped;
   __u32 overlimit;