Fix: iar-cspy-arm.cmake (#23)

* Update iar-cspy-arm.cmake

- cspybat is not strictly required (BX)

Author: Felipe Torrezan

examples/arm/iar-cspy-arm.cmake

@@ -5,8 +5,7 @@ function(iar_cspy_add_test TARGET TEST_NAME EXPECTED_OUTPUT)
   find_program(CSPY_BAT
     NAMES cspybat CSpyBat
     PATHS ${TOOLKIT_DIR}/../common
-    PATH_SUFFIXES bin
-    REQUIRED )
+    PATH_SUFFIXES bin)
 
   # Check if C-SPY is being run from BX
   if(WIN32)