Get rid of checkDeviceTypeOverride (#602)

This is now done in the test harness.

Signed-off-by: Kevin Petit <kevin.petit@arm.com>

test_conformance/images/samplerlessReads/main.cpp

@@ -93,9 +93,6 @@ int main(int argc, const char *argv[])
         return -1;
     }
 
-    //Check CL_DEVICE_TYPE environment variable
-    checkDeviceTypeOverride( &gDeviceType );
-
     const char ** argList = (const char **)calloc( argc, sizeof( char*) );
 
     if( NULL == argList )