kfdtest: Use scalar path for PollMemoryIsa Shader on gfx940

A gfx940 code path was erroneously added to this shader.

It's unneccesary; without this path, the shader uses
the scalar store, which works just fine on gfx940 without changes.

Remove it.

Signed-off-by: David Francis <David.Francis@amd.com>
Change-Id: I825cbbebbdb25c4a7c2f16e228c2bea6a6bcc30c


[ROCm/ROCR-Runtime commit: 2a01e5c33b]

projects/rocr-runtime/tests/kfdtest/src/ShaderStore.cpp

@@ -194,8 +194,6 @@ const char *PollMemoryIsa = R"(
         s_cbranch_scc0   LOOP
         .if (.amdgcn.gfx_generation_number >= 10)
             flat_store_dword v[0:1], v2 slc
-        .elseif (.amdgcn.gfx_generation_number == 9 && .amdgcn.gfx_generation_minor == 4 && .amdgcn.gfx_generation_stepping == 0)
-            flat_store_dword v[0:1], v2 nt sc1 sc0
         .else
             s_store_dword s18, s[2:3], 0x0 glc
         .endif