ArmPlatformPkg: Allow up to 5 Secure Boot DB certs

Update SecureBootDefaultKeys.fdf.inc to add support for 2 more DB
certificates, for a total of 5. This allows all the files from
https://github.com/microsoft/secureboot_objects/tree/main/PreSignedObjects/DB/Certificates
to be supported.

Signed-off-by: Rebecca Cran <rebecca@bsdio.com>

ArmPlatformPkg/SecureBootDefaultKeys.fdf.inc

@@ -38,6 +38,13 @@
   !ifdef $(DB_DEFAULT_FILE3)
     SECTION RAW = $(DB_DEFAULT_FILE3)
   !endif
+  !ifdef $(DB_DEFAULT_FILE4)
+    SECTION RAW = $(DB_DEFAULT_FILE4)
+  !endif
+  !ifdef $(DB_DEFAULT_FILE5)
+    SECTION RAW = $(DB_DEFAULT_FILE5)
+  !endif
+
     SECTION UI = "DB Default"
   }