[build] Mark Realtek driver as permitted for UEFI Secure Boot

The Realtek driver and its dependencies are cleanly structured, easy
to review, directly maintained, and very well tested.  Review these
files and mark them as permitted for UEFI Secure Boot.

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

src/drivers/bitbash/bitbash.c

@@ -22,6 +22,7 @@
  */
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+FILE_SECBOOT ( PERMITTED );
 
 #include <ipxe/bitbash.h>
 

src/drivers/bitbash/spi_bit.c

@@ -22,6 +22,7 @@
  */
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+FILE_SECBOOT ( PERMITTED );
 
 #include <stddef.h>
 #include <stdint.h>

src/drivers/net/realtek.c

@@ -24,6 +24,7 @@
  */
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+FILE_SECBOOT ( PERMITTED );
 
 #include <stdint.h>
 #include <string.h>

src/drivers/net/realtek.h

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

src/drivers/nvs/threewire.c

@@ -22,6 +22,7 @@
  */
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+FILE_SECBOOT ( PERMITTED );
 
 #include <stddef.h>
 #include <string.h>

src/include/ipxe/bitbash.h

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

src/include/ipxe/spi.h

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

src/include/ipxe/spi_bit.h

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

src/include/ipxe/threewire.h

@@ -11,6 +11,7 @@
  */
 
 FILE_LICENCE ( GPL2_OR_LATER );
+FILE_SECBOOT ( PERMITTED );
 
 #include <ipxe/spi.h>
 #include <limits.h>