Remove dtbocfg #91

Job	Run time
Test Build / Test aarch64_generic	57s
Test Build / Test powerpc_464fp	9m 57s
Test Build / Test mipsel_24kc	8m 28s
Test Build / Test arm_cortex-a15_neon-vfpv4	8m 38s
Test Build / Test i386_pentium-mmx	8m 13s
Test Build / Test mips_24kc	8m 51s
Test Build / Test arm_cortex-a9_vfpv3-d16	9m 23s
Test Build / Test riscv64_generic	1m 16s
Test Build / Test x86_64	8m 31s
Test Build / Test powerpc_8548	8m 33s
Test Build / Test mips_24kc	8m 51s
Test Build / Test arm_cortex-a15_neon-vfpv4	8m 38s
Test Build / Test i386_pentium-mmx	8m 13s
Test Build / Test powerpc_464fp	9m 57s
Test Build / Test arm_cortex-a9_vfpv3-d16	9m 23s
Test Build / Test aarch64_generic	9m 38s
Test Build / Test mipsel_24kc	8m 28s
Test Build / Test riscv64_generic	10m 41s
Test Build / Test x86_64	8m 31s
Test Build / Test powerpc_8548	8m 33s
	2h 43m 40s

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