fix(ci): use correct eosim platform names in simulation workflows

Platform names in EoSim YAML configs use suffixed forms:
- x86_64 -> x86_64-linux
- arm64 -> arm64-linux
- riscv64 -> riscv64-linux

Author: srpatcha

.github/workflows/eosim-sanity.yml

@@ -71,11 +71,11 @@ jobs:
       matrix:
         include:
           - guest: Linux x86_64
-            platform: x86_64
+            platform: x86_64-linux
           - guest: Linux aarch64
-            platform: arm64
+            platform: arm64-linux
           - guest: Linux riscv64
-            platform: riscv64
+            platform: riscv64-linux
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5

.github/workflows/simulation-test.yml

@@ -20,9 +20,9 @@ jobs:
       fail-fast: false
       matrix:
         platform:
-          - x86_64
-          - arm64
-          - riscv64
+          - x86_64-linux
+          - arm64-linux
+          - riscv64-linux
           - stm32f4
           - raspi4
           - vexpress-a9