ti-ipc: Update firmware to 08.00.04.02

Update the following ti-ipc firmware
08.00.04.02 for j721s2

IPC update for j721s2.

MD5 Checksums:
2c1ee81e8df4a84a60b95b6675af72df  ti-ipc/j721s2/ipc_echo_test_c7x_1_release_strip.xe71
b808d62220f74647a5e380a5cf60b88d  ti-ipc/j721s2/ipc_echo_test_c7x_2_release_strip.xe71
dfce7841e6e93cd7e5440d2b8d01d5f8  ti-ipc/j721s2/ipc_echo_test_mcu1_1_release_strip.xer5f
7a71a7d0e30d0331f37b0cee4aca5f63  ti-ipc/j721s2/ipc_echo_test_mcu2_0_release_strip.xer5f
6e9638a2f32b4465ac0da4a7d6fdbd1f  ti-ipc/j721s2/ipc_echo_test_mcu2_1_release_strip.xer5f
369a7f6ee0b6bd6392c023fcad6a3d31  ti-ipc/j721s2/ipc_echo_test_mcu3_0_release_strip.xer5f
8e2baef969f56065e66b77bb30524cf9  ti-ipc/j721s2/ipc_echo_test_mcu3_1_release_strip.xer5f

Signed-off-by: Rishabh Garg <rishabh@ti.com>
[praneeth@ti.com: fix WHENCE and firmware permissions]
Signed-off-by: Praneeth Bajjuri <praneeth@ti.com>