Rule: mount_option_boot_efi_nosuid, remove "uefi" platform

The rule does not care about /sys/firmware/efi, so we should not
use existence of this directory as a guardian.

Moreover following the logic of "mount_option" template the rule
will check and remediate options only if mount point
is active/present in /etc/fstab. That's enough to not interfere
with non-UEFI systems.

Author: evgenyz

linux_os/guide/system/permissions/partitions/mount_option_boot_efi_nosuid/rule.yml

@@ -28,8 +28,6 @@ references:
     stigid@ol8: OL08-00-010572
     stigid@rhel8: RHEL-08-010572
 
-platform: uefi
-
 template:
     name: mount_option
     vars: