Update to v6.8 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-6.8

Test: Builds and bionic unit tests pass on raven.
Test: Able to log in to an Android GO 32 bit device.
Change-Id: I0022cdb20c19726f526acaab2866f1e25794b77e
diff --git a/libc/kernel/uapi/linux/smc.h b/libc/kernel/uapi/linux/smc.h
index 4521ceb..5e75fac 100644
--- a/libc/kernel/uapi/linux/smc.h
+++ b/libc/kernel/uapi/linux/smc.h
@@ -132,6 +132,8 @@
   SMC_NLA_LGR_D_CHID,
   SMC_NLA_LGR_D_PAD,
   SMC_NLA_LGR_D_V2_COMMON,
+  SMC_NLA_LGR_D_EXT_GID,
+  SMC_NLA_LGR_D_PEER_EXT_GID,
   __SMC_NLA_LGR_D_MAX,
   SMC_NLA_LGR_D_MAX = __SMC_NLA_LGR_D_MAX - 1
 };