reference log files for CPU trace and UART2 added

Cortex-M0/soclabs_demo/systems/cortex_m0_mcu/rtl_sim/uart2.log_ref

+uartcapture: Generating output file uart2.log using MCD 00000003 @ tb_cmsdk_mcu.u_cmsdk_uart_capture
+ 
+GTRI-soclabs: ARM Cortex-M0 SDK 
+ - load flash 
+ 
+Hello world 
+** TEST PASSED ** 
+Test Ended