Update to android-mainline kernel headers v5.4.

Update generate_uapi_headers.sh to checkout the android mainline
kernel. Also, add a small modification to look for the kernel directory
in common not linux-stable.

Remove deprecated android headers from android/uapi/linux. Also,
remove f_accessory.h since it's in the android mainline kernel.

Test: Builds and runs on walleye.
Change-Id: Ia371305e19f56e6bcc2db6d5b4d299819f07ffc6
diff --git a/libc/kernel/uapi/linux/inet_diag.h b/libc/kernel/uapi/linux/inet_diag.h
index eb9b712..5df55ef 100644
--- a/libc/kernel/uapi/linux/inet_diag.h
+++ b/libc/kernel/uapi/linux/inet_diag.h
@@ -123,9 +123,17 @@
   INET_DIAG_BBRINFO,
   INET_DIAG_CLASS_ID,
   INET_DIAG_MD5SIG,
+  INET_DIAG_ULP_INFO,
   __INET_DIAG_MAX,
 };
 #define INET_DIAG_MAX (__INET_DIAG_MAX - 1)
+enum {
+  INET_ULP_INFO_UNSPEC,
+  INET_ULP_INFO_NAME,
+  INET_ULP_INFO_TLS,
+  __INET_ULP_INFO_MAX,
+};
+#define INET_ULP_INFO_MAX (__INET_ULP_INFO_MAX - 1)
 struct inet_diag_meminfo {
   __u32 idiag_rmem;
   __u32 idiag_wmem;