stdlib: Remove 'exit_on_work_items' from boards' constructor

This has been moved to the `set_kernel_disk_workload` function, and is
set to True by default.

Change-Id: I9df2fa2946dd942b5011f05b948542097310352e
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/52223
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>

tests/gem5/configs/boot_kvm_fork_run.py

@@ -192,7 +192,6 @@ motherboard = X86Board(
     processor=processor,
     memory=memory,
     cache_hierarchy=cache_hierarchy,
-    exit_on_work_items=True,
 )
 
 # Set the Full System workload.

tests/gem5/configs/boot_kvm_switch_exit.py

@@ -175,7 +175,6 @@ motherboard = X86Board(
     processor=processor,
     memory=memory,
     cache_hierarchy=cache_hierarchy,
-    exit_on_work_items=True,
 )
 
 kernal_args = motherboard.get_default_kernel_args() + [args.kernel_args]

tests/gem5/configs/parsec_disk_run.py

@@ -211,7 +211,6 @@ board = X86Board(
     processor=processor,
     memory=memory,
     cache_hierarchy=cache_hierarchy,
-    exit_on_work_items=True,
 )
 
 # The command to run.

tests/gem5/configs/x86_boot_exit_run.py

@@ -182,7 +182,6 @@ motherboard = X86Board(
     processor=processor,
     memory=memory,
     cache_hierarchy=cache_hierarchy,
-    exit_on_work_items=True,
 )
 
 kernal_args = motherboard.get_default_kernel_args()