Add CARE package, fixes for ROCmPackage and subclasses (#20070)

* use develop version of blt with fixes for rocm

* package updates for care+rocm

* fixes for plain cpu build

* add camp dependency on raja

lib/spack/spack/build_systems/rocm.py

@@ -102,6 +102,8 @@ class ROCmPackage(PackageBase):
     depends_on('hsa-rocr-dev', when='+rocm')
     depends_on('hip', when='+rocm')
 
+    conflicts('^blt@:0.3.6', when='+rocm')
+
     # need amd gpu type for rocm builds
     conflicts('amdgpu_target=none', when='+rocm')