ti-sysfw: Update System Firmwares to v08.03.01

Update System Firmwares to version v08.03.01 for am62x platform.

MD5 Checksums:
1b5836c15513b220f1de57cdf1e33089  ti-sysfw/ti-fs-firmware-am62x-gp.bin
bb781b4f6561b476e5ce21ba92e3cd3c  ti-sysfw/ti-fs-stub-firmware-am62x-gp-signed.bin

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