aboot: add support for booting 64bit kernel

Dynamically check weather a given bootimage contains
a 64bit kernel and add support for booting into the 64bit
kernel via secure-monitor(EL3) api.

Change-Id: Ifcc63181258df561d8acdd7ce2374a75113f357a
diff --git a/project/msm8974.mk b/project/msm8974.mk
index b12ea6b..a6ca245 100644
--- a/project/msm8974.mk
+++ b/project/msm8974.mk
@@ -26,6 +26,7 @@
 DEFINES += ABOOT_FORCE_KERNEL_ADDR=0x00008000
 DEFINES += ABOOT_FORCE_RAMDISK_ADDR=0x02000000
 DEFINES += ABOOT_FORCE_TAGS_ADDR=0x01e00000
+DEFINES += ABOOT_FORCE_KERNEL64_ADDR=0x00080000
 
 ifeq ($(EMMC_BOOT),1)
 DEFINES += _EMMC_BOOT=1