tracing: riscv: Add missing invoke of sys_trace_isr_exit()
tracing: riscv: Add missing invoke of sys_trace_isr_exit()

Change suggested by @WealianLiao in #41995.

Signed-off-by: Robert Szczepanski <71aa8b3cc47155bcbef239caf71ec024c5667af4@antmicro.com>

galak/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr