arm-trusted-firmware-mediatek: build RAM boot images for MT7622 #333

Job	Run time
Build all core packages for selected target / Determine Changed Files / Determine Changed Files	8s
Build all core packages for selected target / Determine Changed Packages / Determine Changed Packages	5s
Build all core packages for selected target / Build Packages with external toolchain (x86, 64) / Set up build x86/64	8s
Build all core packages for selected target / Build Packages with external toolchain (malta, be) / Set up build malta/be	5s
Build all core packages for selected target / Build Packages with external toolchain (malta, be) / Build malta/be	50m 1s
Build all core packages for selected target / Build Packages with external toolchain (malta, be) / Check packages for malta/be	3m 20s
Build all core packages for selected target / Build Packages with external toolchain (x86, 64) / Build x86/64	57m 12s
Build all core packages for selected target / Build Packages with external toolchain (x86, 64) / Check packages for x86/64	4m 16s
Build all core packages for selected target / Upload ccache cache to s3	0s
	1h 55m 15s

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