[Hardware][Powerpc]Enable prefix caching and chunked prefill for ppc64le (#35081)

Signed-off-by: Akash kaothalkar <akash.kaothalkar@ibm.com>
Co-authored-by: Akash kaothalkar <akash.kaothalkar@ibm.com>

vllm/engine/arg_utils.py

@@ -2076,20 +2076,19 @@ class EngineArgs:
             )
 
         # Disable chunked prefill and prefix caching for:
-        # POWER (ppc64le)/RISCV CPUs in V1
+        # RISCV CPUs in V1
         if current_platform.is_cpu() and current_platform.get_cpu_architecture() in (
-            CpuArchEnum.POWERPC,
             CpuArchEnum.RISCV,
         ):
             logger.info(
-                "Chunked prefill is not supported for POWER, "
-                "and RISC-V CPUs; "
+                "Chunked prefill is not supported for"
+                "RISC-V CPUs; "
                 "disabling it for V1 backend."
             )
             self.enable_chunked_prefill = False
             logger.info(
-                "Prefix caching is not supported for POWER, "
-                "and RISC-V CPUs; "
+                "Prefix caching is not supported for "
+                "RISC-V CPUs; "
                 "disabling it for V1 backend."
             )
             self.enable_prefix_caching = False