[PATCH] EFI: add missing include

[Michael Olbrich]

Otherwise building produces these warnings:
[...]
arch/efi/efi/efi-image.c:48:2: warning: implicit declaration of function 'read_file' [-Wimplicit-function-declaration]
arch/efi/efi/efi-image.c:48:6: warning: assignment makes pointer from integer without a cast [enabled by default]
[...]

And bootm fails for x86_64. The implicit declaration has an int as return
value, so half of the returned address is lost.

Signed-off-by: Michael Olbrich <m.olbrich at pengutronix.de>
---
 arch/efi/efi/efi-image.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/efi/efi/efi-image.c b/arch/efi/efi/efi-image.c
index 18757d2..d9edd91 100644
--- a/arch/efi/efi/efi-image.c
+++ b/arch/efi/efi/efi-image.c
@@ -31,6 +31,7 @@
 #include <linux/err.h>
 #include <boot.h>
 #include <fs.h>
+#include <libfile.h>
 #include <binfmt.h>
 #include <wchar.h>
 #include <mach/efi.h>
-- 
2.1.0