sandbox: imply PARTITION_TYPE_GUID

CONFIG_PARTITION_TYPE_GUID=y is needed for testing some GPT related
functionality.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/arch/Kconfig b/arch/Kconfig
index ee32e83..ffb8f5c 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -175,6 +175,7 @@
 	imply AVB_VERIFY
 	imply LIBAVB
 	imply CMD_AVB
+	imply PARTITION_TYPE_GUID
 	imply SCP03
 	imply CMD_SCP03
 	imply UDP_FUNCTION_FASTBOOT