platforms: Add RISC-V 32-bit and 64-bit platform files (#8403) #19397

Job	Run time
build_cmake (ubuntu:24.04, true, true)	5m 26s
build_cmake (ubuntu:25.10, true, true)	6m 33s
build_cmake (alpine:3.23, false, false)	4m 14s
build_make (alpine:3.23)	5m 10s
build_make (ubuntu:24.04)	4m 40s
build_make (ubuntu:25.10)	4m 54s
	30m 57s

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