Revert "rockchip: Only call binman when TPL available"

This reverts commit f5315dd6.

[why]
TPL is not mandatory for not all Rockchip SoCs, some SoCs like
RK356x, and RK3588 still use mainline u-boot without TPL as
their ddr init programs are accessed via binaries provided by
Rockchip instead of ddr source code.

Marking TPL build makes it not able to build u-boot.itb on
RK356x targets so revert this so that it can build an SPL build
that would support all across Rockchip platforms.

Suggested-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Tested-by: Anand Moon <linux.amoon@gmail.com>  # CM3