pm9261: enable cache command

Signed-off-by: Asen Dimov <dimov@ronetix.at>
diff --git a/include/configs/pm9261.h b/include/configs/pm9261.h
index c7f0be9..26e5049 100644
--- a/include/configs/pm9261.h
+++ b/include/configs/pm9261.h
@@ -203,6 +203,7 @@
 #undef CONFIG_CMD_LOADS
 #undef CONFIG_CMD_IMLS
 
+#define CONFIG_CMD_CACHE
 #define CONFIG_CMD_PING		1
 #define CONFIG_CMD_DHCP		1
 #define CONFIG_CMD_NAND		1