Bender.yml: Rename snitch_cluster target

Due to collision with `snitch_cluster` target used in iDMA,
whose sources are required by all Snitch-cluster-based  systems,
e.g. Occamy, sources specific to the Snitch cluster simulation
target and not needed by Snitch-cluster-based systems need to
fall under a different Bender target. We rename this to
`snitch_cluster_sim`.

Bender.yml

@@ -234,9 +234,9 @@ sources:
       - target/common/test/tb_bin.sv
 
   # target/snitch_cluster
-  - target: snitch_cluster
+  - target: snitch_cluster_sim
     files:
       - target/snitch_cluster/generated/snitch_cluster_wrapper.sv
-  - target: all(snitch_cluster, any(simulation, verilator))
+  - target: all(snitch_cluster_sim, any(simulation, verilator))
     files:
       - target/snitch_cluster/test/testharness.sv

target/snitch_cluster/Makefile

@@ -61,7 +61,7 @@ CFG         = cfg/lru.hjson
 # Simulator options #
 #####################
 
-COMMON_BENDER_FLAGS += -t snitch_cluster
+COMMON_BENDER_FLAGS += -t snitch_cluster_sim
 
 QUESTA_64BIT = -64
 VLOG_64BIT   = -64