driver: misc: k3_avs: Add support for thermal shutdown

To avoid thermal burn out, program thermal shutdown
value in VTM (Voltage and Thermal Manager) IP.

Part of Linux kernel driver (drivers/thermal/k3_j72xx_bandgap.c)
is ported from kernel 6.6-rc1, which sets thermal shutdown values.

Signed-off-by: Udit Kumar <u-kumar1@ti.com>
Signed-off-by: Neha Francis <n-francis@ti.com>