Don't include SW CRC if not requested

I've got build failure when enable CRC module on STM32. The reason is SW CRC header is included by default  but not by compiler if ChibiOS-Contrib/os/various/ is not included into search path.
The fix includes only requested LL header.

os/hal/include/hal_crc.h

@@ -72,9 +72,13 @@ typedef enum {
   CRC_COMPLETE               /* Asynchronous operation complete.           */
 } crcstate_t;
 
+#if STM32_CRC_USE_CRC1 == TRUE
 #include "hal_crc_lld.h"
-#include "crcsw.h" /* Include software LL driver */
+#endif
 
+#if CRCSW_USE_CRC1 == TRUE
+#include "crcsw.h" /* Include software LL driver */
+#endif
 
 /*===========================================================================*/
 /* Driver macros.                                                            */