debugfs: add FIP device

Add a FIP driver hooked to debugfs 9p interface. This is an
abstraction of the FIP filesystem layer on top of a mass storage,
or memory block driver.

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: If275ea0824763de43ab666dab2a06de5352ff940
diff --git a/lib/debugfs/debugfs.mk b/lib/debugfs/debugfs.mk
index 030556a..2c02600 100644
--- a/lib/debugfs/debugfs.mk
+++ b/lib/debugfs/debugfs.mk
@@ -7,4 +7,5 @@
 DEBUGFS_SRCS	:=	$(addprefix lib/debugfs/,	\
 			dev.c				\
 			devc.c				\
-			devroot.c)
+			devroot.c			\
+			devfip.c)