ti-dm: Update firmware to 08.03.00.xx

Update the following ti-dm firmware
08.03.00.07 for AM62x

This update brings in support for Low Power Mode and more
stable sequence w.r.t DDR.

MD5 Checksum:
13a92ef832f5946bd0b5aec7dffafd7d  ti-dm/am62x/ipc_echo_testb_mcu1_0_release_strip.xer5f

Signed-off-by: Vishal Mahaveer <vishalm@ti.com>

WHENCE

@@ -5356,7 +5356,7 @@ File: ti-dm/j721s2/ipc_echo_testb_mcu1_0_release_strip.xer5f
 Version: 08.00.04.02
 
 File: ti-dm/am62x/am62x/ipc_echo_testb_mcu1_0_release_strip.xer5f
-Version: 08.03.00.04
+Version: 08.03.00.07
 
 Licence: Redistributable. See LICENSE.ti for details.