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/linux/mdio.h b/libc/kernel/uapi/linux/mdio.h
index 7b51b73..7a4d4db 100644
--- a/libc/kernel/uapi/linux/mdio.h
+++ b/libc/kernel/uapi/linux/mdio.h
@@ -15,6 +15,7 @@
 #define MDIO_MMD_DTEXS 5
 #define MDIO_MMD_TC 6
 #define MDIO_MMD_AN 7
+#define MDIO_MMD_POWER_UNIT 13
 #define MDIO_MMD_C22EXT 29
 #define MDIO_MMD_VEND1 30
 #define MDIO_MMD_VEND2 31