cross-canadian.bbclass: Correct deb package arch.

Set DPKG_ARCH to make debian package to be generated with correct
architecture.

Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>

meta/classes/cross-canadian.bbclass

@@ -43,6 +43,9 @@ HOST_OS = "${SDK_OS}"
 HOST_PREFIX = "${SDK_PREFIX}"
 HOST_CC_ARCH = "${SDK_CC_ARCH}"
 
+#assign DPKG_ARCH
+DPKG_ARCH = "${SDK_ARCH}"
+
 CPPFLAGS = "${BUILDSDK_CPPFLAGS}"
 CFLAGS = "${BUILDSDK_CFLAGS}"
 CXXFLAGS = "${BUILDSDK_CFLAGS}"