Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/firmware/xilinx/Makefile b/drivers/firmware/xilinx/Makefile
new file mode 100644
index 0000000..875a537
--- /dev/null
+++ b/drivers/firmware/xilinx/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+# Makefile for Xilinx firmwares
+
+obj-$(CONFIG_ZYNQMP_FIRMWARE) += zynqmp.o
+obj-$(CONFIG_ZYNQMP_FIRMWARE_DEBUG) += zynqmp-debug.o