CI: Fix to ROCm 6.1 (#350)

* CI: Fix ROCm 6.2.0

ROCm 6.1.2->6.2.0 switches Clang 17 to 18.
The current setup led to linker issues:
```
ld.lld: error: undefined hidden symbol: __hip_gpubin_handle_f20551e8c5453d2a
>>> referenced by ld-temp.o
>>>               lto.tmp:(__hip_module_ctor.1796)
>>> referenced by ld-temp.o
>>>               lto.tmp:(__hip_module_ctor.1796)
>>> referenced by ld-temp.o
>>>               lto.tmp:(__hip_module_dtor.1798)
>>> referenced 1 more times
```

switch from clang++ to hipcc as the compiler.

* HIP CI: Ubuntu 20 -> 22

* Remove Workaround from Ubuntu 20 MPI

* ROCm 6.2

* HIP 6.1, Ubuntu 20.04

.github/workflows/dependencies/hip.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright 2022 The ImpactX Community
+# Copyright 2022 The AMReX Community
 #
 # License: BSD-3-Clause-LBNL
 # Authors: Axel Huebl
@@ -32,6 +32,7 @@ echo "deb [arch=amd64] https://repo.radeon.com/rocm/apt/${1-latest} ${UBUNTU_COD
   | sudo tee /etc/apt/sources.list.d/rocm.list
 echo 'export PATH=/opt/rocm/llvm/bin:/opt/rocm/bin:/opt/rocm/profiler/bin:/opt/rocm/opencl/bin:$PATH' \
   | sudo tee -a /etc/profile.d/rocm.sh
+
 # we should not need to export HIP_PATH=/opt/rocm/hip with those installs
 
 sudo apt-get update
@@ -65,3 +66,4 @@ which clang++
 sudo curl -L -o /usr/local/bin/cmake-easyinstall https://raw.githubusercontent.com/ax3l/cmake-easyinstall/main/cmake-easyinstall
 sudo chmod a+x /usr/local/bin/cmake-easyinstall
 export CEI_SUDO="sudo"
+export CEI_TMP="/tmp/cei"

.github/workflows/hip.yml

@@ -8,7 +8,7 @@ concurrency:
 
 jobs:
   build_hip:
-    name: HIP
+    name: ROCm HIP 6.1
     runs-on: ubuntu-20.04
     env:
       CXXFLAGS: "-Werror -Wno-deprecated-declarations -Wno-error=pass-failed"
@@ -18,7 +18,7 @@ jobs:
     - name: install dependencies
       shell: bash
       run: |
-        .github/workflows/dependencies/hip.sh
+        .github/workflows/dependencies/hip.sh 6.1
         .github/workflows/dependencies/dependencies_ccache.sh
     - name: Set Up Cache
       uses: actions/cache@v4