[build] Mark more reviewed files as permitted for UEFI Secure Boot

Mark dynamic keyboard map support and the "pciscan", "usbscan", and
"time" commands as permitted for UEFI Secure Boot, on the basis that
these features have previously been present in binaries signed by
Microsoft.

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

src/core/dynkeymap.c

@@ -22,6 +22,7 @@
  */
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+FILE_SECBOOT ( PERMITTED );
 
 /** @file
  *

src/hci/commands/pci_cmd.c

@@ -30,6 +30,7 @@
 #include <ipxe/parseopt.h>
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+FILE_SECBOOT ( PERMITTED );
 
 /** @file
  *

src/hci/commands/time_cmd.c

@@ -21,6 +21,7 @@
  */
 
 FILE_LICENCE ( GPL2_OR_LATER );
+FILE_SECBOOT ( PERMITTED );
 
 #include <stdio.h>
 #include <stdlib.h>

src/hci/commands/usb_cmd.c

@@ -30,6 +30,7 @@
 #include <ipxe/parseopt.h>
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+FILE_SECBOOT ( PERMITTED );
 
 /** @file
  *