ti-ipc: am64xx: Update IPC firmwares for am64xx

Update Inter Processor Communication (IPC) firmwares for am64xx
from the mcuplus SDK version 08.05.00.1

Major updates
- Update R5 FW to run in thumb mode to reduce memory footprint

md5sums of new firmwares:
5104f17158114b2e4572bbac61d9aa9c  ti-ipc/am64xx/am64-main-r5f0_0-fw
0a40ef5befa2af467b1260155fe151b8  ti-ipc/am64xx/am64-main-r5f0_1-fw
85a79532761a522dbb569f05f4e38c13  ti-ipc/am64xx/am64-main-r5f1_0-fw
25f8a30484a139c85a8de0f4ad5ad3bc  ti-ipc/am64xx/am64-main-r5f1_1-fw
a257dc5570a42b50508e71204ef0470b  ti-ipc/am64xx/am64-mcu-m4f0_0-fw

Signed-off-by: Anoop <anoop.rk@ti.com>