[llvm] AMDGPU: Add gfx1250 to sram-ecc elf header flags test (PR #162107)

[Shilei Tian via llvm-commits]

https://github.com/shiltian commented:

We didn't mark sramecc as a supported feature in `llvm/lib/TargetParser/TargetParser.cpp`.

https://github.com/llvm/llvm-project/pull/162107