Update to v6.12 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-6.12

Comment out the TAG usage of the __struct_group macro in linux/pkt_cls.h.
The kernel upstream is either going to revert this usage of __struct_group
or fix this in another way. When set, it creates a named struct in an
anonyous union, which is not allowed in C++.

Test: Builds and bionic unit tests pass on raven.
Change-Id: Ibb49550dfdc86fa0fc888b51d893959b6d433c59
diff --git a/libc/kernel/uapi/asm-arm64/asm/hwcap.h b/libc/kernel/uapi/asm-arm64/asm/hwcap.h
index f5c720a..45cc945 100644
--- a/libc/kernel/uapi/asm-arm64/asm/hwcap.h
+++ b/libc/kernel/uapi/asm-arm64/asm/hwcap.h
@@ -101,4 +101,5 @@
 #define HWCAP2_SME_SF8FMA (1UL << 60)
 #define HWCAP2_SME_SF8DP4 (1UL << 61)
 #define HWCAP2_SME_SF8DP2 (1UL << 62)
+#define HWCAP2_POE (1UL << 63)
 #endif