ddr: driver: independent ddr firmware [2/2]

PD#165375

Problem:
bl2 code size limit

Solution:
move ddr driver out of bl2, build as independ fw

Verify:
test pass on u200 and skt

Change-Id: I66f2283b6d9320b5fd7bc14f28ff7006436828c6
Signed-off-by: xiaobo gu <xiaobo.gu@amlogic.com>
diff --git a/variables.sh b/variables.sh
index c12a640..a0a41d2 100755
--- a/variables.sh
+++ b/variables.sh
@@ -7,7 +7,7 @@
 BUILD_FOLDER="build/"
 FIP_FOLDER="fip/"
 MANIFEST=".repo/manifest.xml"
-FIP_BUILD_FOLDER="fip/build/"
+FIP_BUILD_FOLDER="fip/_tmp/"
 
 # include uboot pre-build defines
 SOURCE_FILE=("bl33/build/.config")