Fix DMA stream ID calculation in ws2812_pwm (#10008)

Some STM32 chips have STM32_DMA1_STREAM1 as the first DMA stream, others
(F4xx, F7xx, H7xx) have STM32_DMA1_STREAM0.  Instead of those names, use
STM32_DMA_STREAM(0), which should always give the first stm32_dma_stream_t
structure in the DMA streams array, so that the stream ID would be
calculated correctly.

drivers/chibios/ws2812_pwm.c

@@ -180,7 +180,7 @@ void ws2812_init(void) {
 
     // Configure DMA
     // dmaInit(); // Joe added this
-    dmaStreamAlloc(WS2812_DMA_STREAM - STM32_DMA1_STREAM1, 10, NULL, NULL);
+    dmaStreamAlloc(WS2812_DMA_STREAM - STM32_DMA_STREAM(0), 10, NULL, NULL);
     dmaStreamSetPeripheral(WS2812_DMA_STREAM, &(WS2812_PWM_DRIVER.tim->CCR[WS2812_PWM_CHANNEL - 1]));  // Ziel ist der An-Zeit im Cap-Comp-Register
     dmaStreamSetMemory0(WS2812_DMA_STREAM, ws2812_frame_buffer);
     dmaStreamSetTransactionSize(WS2812_DMA_STREAM, WS2812_BIT_N);