ram: k3-ddrss: add auto-generated macros for am62a support

The new 32bit DDR controller for TI's am62a family of SoCs shares much
of the same functionality with the existing 16bit (am64) and 32bit
(j721e) controllers, so this patch reorganizes the existing
auto-generated macros for the 16bit and 32bit controllers to make room
for the macros for the am62a's controller

This patch consists mostly of header/macro renames and additions with a
new Kconfig option (K3_AM62A_DDRSS) allowing us to select these new
macros during compilation.

Signed-off-by: Bryan Brattlof <bb@ti.com>

ram: k3-ddrss: Introduce common driver with J7 SoC support

Introduce a new version of the ddr driver which has the ability to
support different variations of the controller. Also introduce support
for the 32bit variation of the controller which is what was already
supported by the previous version used for J721e and J7200.

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

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>

ram: k3-ddrss: Introduce common driver with J7 SoC support

Introduce a new version of the ddr driver which has the ability to
support different variations of the controller. Also introduce support
for the 32bit variation of the controller which is what was already
supported by the previous version used for J721e and J7200.

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

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>