[CI] Remove AMDGPU testing from postcommit (#17668)

We only have one runner which is constantly overloaded and we already
test AMDGPU in precommit.

Signed-off-by: Sarnie, Nick <[email protected]>

Author: sarnex

.github/workflows/sycl-post-commit.yml

@@ -58,11 +58,6 @@ jobs:
             runner: '["Linux", "arc"]'
             extra_lit_opts: --param matrix-xmx8=True
             reset_intel_gpu: true
-          - name: AMD/HIP
-            runner: '["Linux", "amdgpu"]'
-            image_options: -u 1001 --device=/dev/dri --device=/dev/kfd
-            target_devices: hip:gpu
-            reset_intel_gpu: false
           # Performance tests below. Specifics:
           #  - only run performance tests (use LIT_FILTER env)
           #  - ask llvm-lit to show all the output, even for PASS (-a)