omap: drop v6.12 and default to v6.18 #5262

Job	Run time
Build all core packages for selected target / Determine Changed Files / Determine Changed Files	11s
Build all core packages for selected target / Determine Changed Packages / Determine Changed Packages	8s
Build all core packages for selected target / Build Packages with external toolchain (malta, be) / Set up build malta/be	9s
Build all core packages for selected target / Build Packages with external toolchain (x86, 64) / Set up build x86/64	11s
Build all core packages for selected target / Build Packages with external toolchain (malta, be) / Build malta/be	1h 15m 12s
Build all core packages for selected target / Build Packages with external toolchain (malta, be) / Check packages for malta/be	3m 21s
Build all core packages for selected target / Build Packages with external toolchain (x86, 64) / Build x86/64	1h 40m 43s
Build all core packages for selected target / Build Packages with external toolchain (x86, 64) / Check packages for x86/64	3m 13s
Build all core packages for selected target / Upload ccache cache to s3	0s
	3h 3m 8s

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