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/perf_event.h b/libc/kernel/uapi/linux/perf_event.h
index 229184f..4e9e32c 100644
--- a/libc/kernel/uapi/linux/perf_event.h
+++ b/libc/kernel/uapi/linux/perf_event.h
@@ -99,7 +99,8 @@
   PERF_SAMPLE_TRANSACTION = 1U << 17,
   PERF_SAMPLE_REGS_INTR = 1U << 18,
   PERF_SAMPLE_PHYS_ADDR = 1U << 19,
-  PERF_SAMPLE_MAX = 1U << 20,
+  PERF_SAMPLE_AUX = 1U << 20,
+  PERF_SAMPLE_MAX = 1U << 21,
   __PERF_SAMPLE_CALLCHAIN_EARLY = 1ULL << 63,
 };
 enum perf_branch_sample_type_shift {
@@ -188,6 +189,7 @@
 #define PERF_ATTR_SIZE_VER3 96
 #define PERF_ATTR_SIZE_VER4 104
 #define PERF_ATTR_SIZE_VER5 112
+#define PERF_ATTR_SIZE_VER6 120
 struct perf_event_attr {
   __u32 type;
   __u32 size;
@@ -224,6 +226,8 @@
   __u32 aux_watermark;
   __u16 sample_max_stack;
   __u16 __reserved_2;
+  __u32 aux_sample_size;
+  __u32 __reserved_3;
 };
 struct perf_event_query_bpf {
   __u32 ids_len;