ti-dm: Update firmware to 07.03.00.21

Update the ti-dm firmware from 07.03.00.1x to
07.03.00.21 for J721E and J7200

This firmware is compatible with the TIFS v2021.01a.

MD5 Checksums:
92cffd237ccec87549a866ad6a46873e  ti-dm/j721e/ipc_echo_testb_mcu1_0_release_strip.xer5f
cfae4b69419d7aac67c92bcb62c195a8  ti-dm/j7200/ipc_echo_testb_mcu1_0_release_strip.xer5f

Binaries obtained:
J7200: https://git.ti.com/cgit/processor-sdk/coresdk_rtos_releases/tag/?h=REL.CORESDK.J7200.07.03.00.21
J721E: https://git.ti.com/cgit/processor-sdk/coresdk_rtos_releases/tag/?h=REL.CORESDK.J721E.07.03.00.21



Signed-off-by: Praneeth Bajjuri <praneeth@ti.com>