build_all.sh: integrate firmware publishing [1/1]

PD#SWPL-67525

Problem:
integrate firmware publishing

Solution:
integrate firmware publishing

Verify:
ad401_a113l

Signed-off-by: Kelvin Zhang <kelvin.zhang@amlogic.com>
Change-Id: If1e77b65fb03d2195d7e97e5f0313d72989fc5ba
diff --git a/env.sh b/env.sh
index f44200e..8553c52 100755
--- a/env.sh
+++ b/env.sh
@@ -160,4 +160,6 @@
 	STACKTRACE_ENABLE=1
 fi
 
-export ARCH BOARD COMPILER PRODUCT SOC TOOLCHAIN_KEYWORD STACKTRACE_ENABLE
+KERNEL=freertos
+
+export ARCH BOARD COMPILER KERNEL PRODUCT SOC TOOLCHAIN_KEYWORD STACKTRACE_ENABLE