Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild
index 6cd5d77..98a5405 100644
--- a/arch/arm64/include/asm/Kbuild
+++ b/arch/arm64/include/asm/Kbuild
@@ -1,8 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
 generic-y += bugs.h
 generic-y += delay.h
 generic-y += div64.h
 generic-y += dma.h
 generic-y += dma-contiguous.h
+generic-y += dma-mapping.h
 generic-y += early_ioremap.h
 generic-y += emergency-restart.h
 generic-y += hw_irq.h
@@ -13,18 +15,14 @@
 generic-y += local64.h
 generic-y += mcs_spinlock.h
 generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
 generic-y += msi.h
-generic-y += preempt.h
 generic-y += qrwlock.h
 generic-y += qspinlock.h
-generic-y += rwsem.h
-generic-y += segment.h
 generic-y += serial.h
 generic-y += set_memory.h
-generic-y += sizes.h
 generic-y += switch_to.h
 generic-y += trace_clock.h
 generic-y += unaligned.h
 generic-y += user.h
 generic-y += vga.h
-generic-y += xor.h