ram: k3-j721e: Rename to k3-ddrss

Rename the k3-j721e folder under drivers/ram to k3-ddrss in preparation
of introducing additional support for other platforms to the same
driver.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>

drivers/ram/Makefile

@@ -15,7 +15,7 @@ obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/
 obj-$(CONFIG_K3_AM654_DDRSS) += k3-am654-ddrss.o
 obj-$(CONFIG_ARCH_MEDIATEK) += mediatek/
 obj-$(CONFIG_ARCH_ASPEED) += aspeed/
-obj-$(CONFIG_K3_J721E_DDRSS) += k3-j721e/
+obj-$(CONFIG_K3_J721E_DDRSS) += k3-ddrss/
 
 obj-$(CONFIG_IMXRT_SDRAM) += imxrt_sdram.o