Add plp-mtu-discovery and bsbf-plpmtu #28841

Job	Run time
Test Formalities	13s
Feeds Package Test Build / Test aarch64_generic	21m 38s
Feeds Package Test Build / Test mipsel_24kc	19m 11s
Feeds Package Test Build / Test arm_cortex-a9_vfpv3-d16	21m 38s
Feeds Package Test Build / Test arm_cortex-a15_neon-vfpv4	22m 28s
Feeds Package Test Build / Test i386_pentium-mmx	21m 33s
Feeds Package Test Build / Test mips_24kc	20m 44s
Feeds Package Test Build / Test powerpc_464fp	17m 25s
Feeds Package Test Build / Test powerpc_8548	17m 31s
Feeds Package Test Build / Test riscv64_generic	21m 37s
Feeds Package Test Build / Test x86_64	22m 15s
	3h 26m 13s

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