libpayload arm64: Add dummy_media file

This is required for proper compilation of libpayload and depthcharge

BUG=None
BRANCH=None
TEST=libpayload compiles successfully for rush

Original-Change-Id: I305b58b978fd335e20abd7664c3ee2a6c1ea8384
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/204422
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
(cherry picked from commit eef115c2371c6f7259bf808e0448f24a5b3491ab)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: Icd6a5b8a0bdb125de4913fc82be8cb2a5aef5dc9
Reviewed-on: http://review.coreboot.org/8120
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/payloads/libpayload/arch/arm64/Makefile.inc b/payloads/libpayload/arch/arm64/Makefile.inc
index 682e58b..45582e0 100644
--- a/payloads/libpayload/arch/arm64/Makefile.inc
+++ b/payloads/libpayload/arch/arm64/Makefile.inc
@@ -37,6 +37,7 @@
 libc-y += memcpy.S memset.S memmove.S
 libc-y += exception_asm.S exception.c
 libc-y += cache.c cpu.S
+libcbfs-$(CONFIG_LP_CBFS) += dummy_media.c
 
 # Add other classes here when you put assembly files into them!
  head.o-S-ccopts += $(arm64_asm_flags)