ARM: MediaTek: Add support for MediaTek MT7622 SoC

Add support for MediaTek MT7622 SoC. This include the file
that will initialize the SoC after boot and its device tree.

diff --git a/arch/arm/mach-mediatek/mt7622/Makefile b/arch/arm/mach-mediatek/mt7622/Makefile
new file mode 100644
index 0000000..886ab7e
--- /dev/null
+++ b/arch/arm/mach-mediatek/mt7622/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier:	GPL-2.0
+
+obj-y += init.o