T7423: Add kernel boot options isolcpus, hugepages, numa_balancing

Add kernel options which apply during the boot:
 - isolcpus
 - nohz_full
 - rcu_nocbs
 - default_hugepagesz
 - hugepages
 - hugepagesz
 - numa_balancing
 - hpet
 - mce
 - nosoftlockup
 - nmi_watchdog

CLI:

```
set system option kernel cpu disable-nmi-watchdog
set system option kernel cpu isolate-cpus '1,2,4-5'
set system option kernel cpu nohz-full '1,2,4-5'
set system option kernel cpu rcu-no-cbs '1,2,4-5'
set system option kernel disable-hpet
set system option kernel disable-mce
set system option kernel disable-softlockup
set system option kernel memory default-hugepage-size '2M'
set system option kernel memory disable-numa-balancing
set system option kernel memory hugepage-size 1G hugepage-count '2'
set system option kernel memory hugepage-size 2M hugepage-count '512'
```

1 files changed, 43 insertions, 0 deletions

diff --git a/src/validators/cpu b/src/validators/cpu
new file mode 100755
index 000000000..959a49248
--- /dev/null
+++ b/src/validators/cpu
@@ -0,0 +1,43 @@
+#!/usr/bin/python3
+
+import re
+import sys
+
+MAX_CPU = 511
+
+
+def validate_isolcpus(value):
+    pattern = re.compile(r'^(\d{1,3}(-\d{1,3})?)(,(\d{1,3}(-\d{1,3})?))*$')
+    if not pattern.fullmatch(value):
+        return False
+
+    flat_list = []
+    for part in value.split(','):
+        if '-' in part:
+            start, end = map(int, part.split('-'))
+            if start > end or start < 0 or end > MAX_CPU:
+                return False
+            flat_list.extend(range(start, end + 1))
+        else:
+            num = int(part)
+            if num < 0 or num > MAX_CPU:
+                return False
+            flat_list.append(num)
+
+    for i in range(1, len(flat_list)):
+        if flat_list[i] <= flat_list[i - 1]:
+            return False
+
+    return True
+
+
+if __name__ == "__main__":
+    if len(sys.argv) != 2:
+        print("Usage: python3 cpu.py <cpu_list>")
+        sys.exit(1)
+
+    input_value = sys.argv[1]
+    if validate_isolcpus(input_value):
+        sys.exit(0)
+    else:
+        sys.exit(1)