Add a variable specifying arch-specific folder

Tests can use it to locate architecture specific files

Signed-off-by: Frédéric Dalleau <frederic.dalleau@collabora.com>

update-test-path

@@ -6,7 +6,10 @@ PATH=${TESTPATH}/common:${TESTPATH}/bin:$PATH
 
 # Path for architecture specific binaries
 case `uname -m` in
-x86_64) PATH=${TESTPATH}/amd64/bin:$PATH; ;;
-armv7l) PATH=${TESTPATH}/armhf/bin:$PATH; ;;
-aarch64) PATH=${TESTPATH}/arm64/bin:$PATH; ;;
+x86_64)  ARCHDIR=amd64 ;;
+armv7l)  ARCHDIR=armhf ;;
+aarch64) ARCHDIR=arm64 ;;
 esac
+
+PATH=${TESTPATH}/${ARCHDIR}/bin:$PATH
+