Revert "Revert "Fastbootd: flashing certification""

CMS functionality is now available

This reverts commit 068b71dd9cd6cb03dfcdc0c9deced361780bc0d3.

Conflicts:
	fastbootd/Android.mk
	fastbootd/fastbootd.c
	fastbootd/utils.c
	fastbootd/utils.h

Change-Id: I1a27459b41d9297603deb124c65f237ff971e5b6
diff --git a/fastbootd/commands/flash.h b/fastbootd/commands/flash.h
index 8ffd688..86dc811 100644
--- a/fastbootd/commands/flash.h
+++ b/fastbootd/commands/flash.h
@@ -58,5 +58,7 @@
     return readcount;
 }
 
+int flash_validate_certificate(int signed_fd, int *data_fd);
+
 #endif