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/ppp-ioctl.h b/libc/kernel/uapi/linux/ppp-ioctl.h
index b0f893b..f188dff 100644
--- a/libc/kernel/uapi/linux/ppp-ioctl.h
+++ b/libc/kernel/uapi/linux/ppp-ioctl.h
@@ -94,6 +94,8 @@
 #define PPPIOCGDEBUG _IOR('t', 65, int)
 #define PPPIOCSDEBUG _IOW('t', 64, int)
 #define PPPIOCGIDLE _IOR('t', 63, struct ppp_idle)
+#define PPPIOCGIDLE32 _IOR('t', 63, struct ppp_idle32)
+#define PPPIOCGIDLE64 _IOR('t', 63, struct ppp_idle64)
 #define PPPIOCNEWUNIT _IOWR('t', 62, int)
 #define PPPIOCATTACH _IOW('t', 61, int)
 #define PPPIOCDETACH _IOW('t', 60, int)