capsule_cabinet.sh: support passing EDK2 dir as env variable

Change-Id: Ifaa44cb0e55165694aee422a003518e2f21d21a3
Signed-off-by: Michał Kopeć <[email protected]>

Author: mkopec

capsule_cabinet.sh

@@ -3,9 +3,8 @@
 
 set -e
 
-edk_workspace=payloads/external/edk2/workspace
-edk_tools=${edk_workspace}/Dasharo/BaseTools/BinWrappers/PosixLike
-edk_scripts=${edk_workspace}/Dasharo/BaseTools/Scripts
+edk_workspace=${EDK_WORKSPACE:-payloads/external/edk2/workspace/Dasharo}
+edk_tools=${edk_workspace}/BaseTools/BinWrappers/PosixLike
 
 function die() {
     echo error: "$@" 1>&2