Remove dummy timing implementation

Having such implementation might cause issues for those that
expect to have a working implementation.
Having a compile-time error is better in such case.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
diff --git a/library/timing.c b/library/timing.c
index a65bc99..9a35eed 100644
--- a/library/timing.c
+++ b/library/timing.c
@@ -167,33 +167,6 @@
 {
     return( data->fin_ms );
 }
-#else /* MBEDTLS_HAVE_TIME */
-uint32_t mbedtls_timing_get_final_delay(
-                                      const mbedtls_timing_delay_context *data )
-{
-    (void) data;
-    return( 0 );
-}
-
-int mbedtls_timing_get_delay( void *data )
-{
-    (void) data;
-    return( 0 );
-}
-void mbedtls_timing_set_delay( void *data, uint32_t int_ms, uint32_t fin_ms )
-{
-    (void) data;
-    (void) int_ms;
-    (void) fin_ms;
-}
-
-unsigned long mbedtls_timing_get_timer( struct mbedtls_timing_hr_time *val, int reset )
-{
-    (void) val;
-    (void) reset;
-    return( 0 );
-}
-
 #endif /* MBEDTLS_HAVE_TIME */
 #endif /* !MBEDTLS_TIMING_ALT */
 #endif /* MBEDTLS_TIMING_C */