dts: vendor: raspberrypi: Default to sysbuild partitions

Switch the default partitions for raspberrypi to use the sysbuild
partitions in order to be consistent with the default partitions for
other vendor defined partitions.

Please refer to this PR for comments relating to this modification:
 - zephyrproject-rtos/mcuboot#128

Signed-off-by: John Lin <john.lin@beechwoods.com>

Author: jlbwoods

dts/vendor/raspberrypi/partitions_2M_default.dtsi

@@ -4,4 +4,4 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <raspberrypi/partitions_2M_storage.dtsi>
+#include <raspberrypi/partitions_2M_sysbuild.dtsi>