rockchip: Support building the all output files in binman

Add the required binman images to replace the Makefile rules which are
currently used. This includes subsuming:

   - tpl/u-boot-tpl-rockchip.bin if TPL is enabled
   - idbloader.img if either or both of SPL and TPL are enabled
   - u-boot.itb if SPL_FIT is enabled
   - u-boot-rockchip.bin if SPL is used, either using u-boot.itb when
     SPL_FIT is enabled or u-boot.img when it isn't

Note that the intermediate files are dropped with binman, since it
producing everything in one pass. This means that
tpl/u-boot-tpl-rockchip.bin is not created, for example.

Note that for some 32-bit rk3288 boards, rockchip-optee.dtsi is included.

Signed-off-by: Simon Glass <sjg@chromium.org>