Add plp-mtu-discovery and bsbf-plpmtu #28839

Job	Run time
Test Formalities	16s
Feeds Package Test Build / Test arm_cortex-a9_vfpv3-d16	1s
Feeds Package Test Build / Test mips_24kc	1s
Feeds Package Test Build / Test i386_pentium-mmx	9m 11s
Feeds Package Test Build / Test riscv64_generic	1s
Feeds Package Test Build / Test aarch64_generic	9m 10s
Feeds Package Test Build / Test arm_cortex-a15_neon-vfpv4	1s
Feeds Package Test Build / Test mipsel_24kc	1s
Feeds Package Test Build / Test x86_64	1s
Feeds Package Test Build / Test powerpc_8548	1s
Feeds Package Test Build / Test powerpc_464fp	1s
	18m 45s

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