Add the RESET_ATTACK_MITIGATION check according to the feature request #11

Let's check the RESET_ATTACK_MITIGATION option.

The description of this security feature:
https://lwn.net/Articles/730006/

It needs support from the userspace side:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a5c03c31af2291f13689d11760c0b59fb70c9a5a

Improve the comments about the userspace support by the way.

README.md

@@ -93,6 +93,7 @@ optional arguments:
   CONFIG_SECURITY_DMESG_RESTRICT         |      y      |    my    |  self_protection   ||     FAIL: "is not set"     
   CONFIG_STATIC_USERMODEHELPER           |      y      |    my    |  self_protection   ||     FAIL: "is not set"     
   CONFIG_SECURITY_LOADPIN                |      y      |    my    |  self_protection   ||     FAIL: "is not set"     
+  CONFIG_RESET_ATTACK_MITIGATION         |      y      |    my    |  self_protection   ||             OK             
   CONFIG_PAGE_POISONING_NO_SANITY        | is not set  |    my    |  self_protection   ||       OK: not found        
   CONFIG_PAGE_POISONING_ZERO             | is not set  |    my    |  self_protection   ||       OK: not found        
   CONFIG_SLAB_MERGE_DEFAULT              | is not set  |    my    |  self_protection   ||         FAIL: "y"          

kconfig-hardened-check.py

@@ -207,8 +207,9 @@ def construct_checklist(arch):
     checklist.append(OptCheck('LOCK_DOWN_KERNEL',                 'y', 'my', 'self_protection')) # remember about LOCK_DOWN_MANDATORY
     checklist.append(OptCheck('SLUB_DEBUG_ON',                    'y', 'my', 'self_protection'))
     checklist.append(OptCheck('SECURITY_DMESG_RESTRICT',          'y', 'my', 'self_protection'))
-    checklist.append(OptCheck('STATIC_USERMODEHELPER',            'y', 'my', 'self_protection')) # breaks systemd?
-    checklist.append(OptCheck('SECURITY_LOADPIN',                 'y', 'my', 'self_protection'))
+    checklist.append(OptCheck('STATIC_USERMODEHELPER',            'y', 'my', 'self_protection')) # needs userspace support (systemd)
+    checklist.append(OptCheck('SECURITY_LOADPIN',                 'y', 'my', 'self_protection')) # needs userspace support
+    checklist.append(OptCheck('RESET_ATTACK_MITIGATION',          'y', 'my', 'self_protection')) # needs userspace support (systemd)
     checklist.append(OptCheck('PAGE_POISONING_NO_SANITY',         'is not set', 'my', 'self_protection'))
     checklist.append(OptCheck('PAGE_POISONING_ZERO',              'is not set', 'my', 'self_protection'))
     checklist.append(OptCheck('SLAB_MERGE_DEFAULT',               'is not set', 'my', 'self_protection')) # slab_nomerge