tests: Fix import path in simple_binary_run.py

We should be using gem5.components instead of python.gem5.components.
In https://gem5-review.git.corp.google.com/c/public/gem5/+/68518 I was
seeing the RISC-V tests fail with
`ModuleNotFoundError: No module named 'python.gem5.components.processors.base_cpu_core'`.

This fixes the issue for me with the RISC-V tests. I also searched for
other similar imports and I've removed a similar (unused) one in
x86_boot_exit_run.py.

Change-Id: I61a0c4c27724854956f778f14e1fcfafea927ffd
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/68757
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>

tests/gem5/configs/simple_binary_run.py

@@ -40,6 +40,7 @@ from gem5.components.memory import SingleChannelDDR3_1600
 from gem5.components.boards.simple_board import SimpleBoard
 from gem5.components.cachehierarchies.classic.no_cache import NoCache
 from gem5.components.processors.simple_processor import SimpleProcessor
+from gem5.components.processors.base_cpu_core import BaseCPUCore
 from gem5.components.processors.base_cpu_processor import BaseCPUProcessor
 from gem5.components.processors.simple_core import SimpleCore
 from gem5.components.boards.mem_mode import MemMode
@@ -52,8 +53,6 @@ from m5.util import fatal
 import argparse
 import importlib
 
-from python.gem5.components.processors.base_cpu_core import BaseCPUCore
-
 cpu_types_string_map = {
     CPUTypes.ATOMIC: "AtomicSimpleCPU",
     CPUTypes.O3: "O3CPU",

tests/gem5/configs/x86_boot_exit_run.py

@@ -46,9 +46,6 @@ from gem5.resources.workload import Workload
 import argparse
 import importlib
 
-from python.gem5.components.boards.kernel_disk_workload import (
-    KernelDiskWorkload,
-)
 
 parser = argparse.ArgumentParser(
     description="A script to run the gem5 boot test. This test boots the "