Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/x86/include/asm/sections.h b/arch/x86/include/asm/sections.h
index 4a911a3..71b32f2 100644
--- a/arch/x86/include/asm/sections.h
+++ b/arch/x86/include/asm/sections.h
@@ -11,7 +11,8 @@
 
 #if defined(CONFIG_X86_64)
 extern char __end_rodata_hpage_align[];
-extern char __entry_trampoline_start[], __entry_trampoline_end[];
 #endif
 
+extern char __end_of_kernel_reserve[];
+
 #endif	/* _ASM_X86_SECTIONS_H */