[llvm] [llvm-objcopy] Support SREC output format (PR #75874)

[Fangrui Song via llvm-commits]

================
@@ -0,0 +1,11 @@
+# RUN: yaml2obj %p/Inputs/srec-elf-sections.yaml -o %t
----------------
MaskRay wrote:

`srec-elf-sections.yaml` is only used by one test.  We prefer inlining the data into the main test file.

https://github.com/llvm/llvm-project/pull/75874