Update to v5.6 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.6

Add a new method for removing structures. This is to deal with the kernel
headers changing some definitions of timeval to __kernel_old_timeval
and itimerval to __kernel_old_itimerval. Remove the __kernel_old_XX
strutures and change the other structures to the previous definitions.

This only works so long as these structures stay the same, if they
diverge, then a different strategy will need to be implemented.

Test: Booted cuttlefish/walleye.
Test: Ran bionic-unit-tests on cuttlefish/walleye.
Change-Id: I0a61f4fa6e4155c602e0414d9b38c2e1637829af
diff --git a/libc/kernel/uapi/linux/input-event-codes.h b/libc/kernel/uapi/linux/input-event-codes.h
index ee0e92f..46cc7f0 100644
--- a/libc/kernel/uapi/linux/input-event-codes.h
+++ b/libc/kernel/uapi/linux/input-event-codes.h
@@ -572,6 +572,7 @@
 #define KEY_DATA 0x277
 #define KEY_ONSCREEN_KEYBOARD 0x278
 #define KEY_PRIVACY_SCREEN_TOGGLE 0x279
+#define KEY_SELECTIVE_SCREENSHOT 0x27a
 #define KEY_MACRO1 0x290
 #define KEY_MACRO2 0x291
 #define KEY_MACRO3 0x292