[build] Mark core files as permitted for UEFI Secure Boot

Mark all files used in a standard build of bin-x86_64-efi/snponly.efi
as permitted for UEFI Secure Boot.  These files represent the core
functionality of iPXE that is guaranteed to have been included in
every binary that was previously subject to a security review and
signed by Microsoft.  It is therefore legitimate to assume that at
least these files have already been reviewed to the required standard
multiple times.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/include/usr/autoboot.h

@@ -8,6 +8,7 @@
  */
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+FILE_SECBOOT ( PERMITTED );
 
 #include <ipxe/device.h>
 

src/include/usr/dhcpmgmt.h

@@ -8,6 +8,7 @@
  */
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+FILE_SECBOOT ( PERMITTED );
 
 struct net_device;
 

src/include/usr/ifmgmt.h

@@ -8,6 +8,7 @@
  */
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+FILE_SECBOOT ( PERMITTED );
 
 struct net_device;
 struct net_device_configurator;

src/include/usr/imgmgmt.h

@@ -8,6 +8,7 @@
  */
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+FILE_SECBOOT ( PERMITTED );
 
 #include <ipxe/image.h>
 

src/include/usr/prompt.h

@@ -8,6 +8,7 @@
  */
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+FILE_SECBOOT ( PERMITTED );
 
 extern int prompt ( const char *text, unsigned long timeout, int key );
 

src/include/usr/route.h

@@ -8,6 +8,7 @@
  */
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+FILE_SECBOOT ( PERMITTED );
 
 #include <ipxe/tables.h>
 

src/include/usr/shimmgmt.h

@@ -8,6 +8,7 @@
  */
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+FILE_SECBOOT ( PERMITTED );
 
 #include <ipxe/image.h>
 

src/include/usr/sync.h

@@ -8,6 +8,7 @@
  */
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+FILE_SECBOOT ( PERMITTED );
 
 extern int sync ( unsigned long timeout );