stmhal/dma: Don't include SDMMC2 struct if SDMMC2 is not available.

Not all F7 MCUs have SDMMC2.

stmhal/dma.c

@@ -186,7 +186,7 @@ const dma_descr_t dma_I2C_1_TX = { DMA1_Stream6, DMA_CHANNEL_1, DMA_MEMORY_TO_PE
 */
 
 // DMA2 streams
-#if defined(MCU_SERIES_F7) && MICROPY_HW_HAS_SDCARD
+#if defined(MCU_SERIES_F7) && defined(SDMMC2) && MICROPY_HW_HAS_SDCARD
 const dma_descr_t dma_SDMMC_2_RX= { DMA2_Stream0, DMA_CHANNEL_11, DMA_PERIPH_TO_MEMORY, dma_id_8,  &dma_init_struct_sdio };
 #endif
 const dma_descr_t dma_SPI_1_RX = { DMA2_Stream2, DMA_CHANNEL_3, DMA_PERIPH_TO_MEMORY, dma_id_10,  &dma_init_struct_spi_i2c };
@@ -199,7 +199,7 @@ const dma_descr_t dma_SPI_5_TX = { DMA2_Stream4, DMA_CHANNEL_2, DMA_MEMORY_TO_PE
 const dma_descr_t dma_SPI_4_TX = { DMA2_Stream4, DMA_CHANNEL_5, DMA_MEMORY_TO_PERIPH, dma_id_12,  &dma_init_struct_spi_i2c };
 const dma_descr_t dma_SPI_6_TX = { DMA2_Stream5, DMA_CHANNEL_1, DMA_MEMORY_TO_PERIPH, dma_id_13,  &dma_init_struct_spi_i2c };
 const dma_descr_t dma_SPI_1_TX = { DMA2_Stream5, DMA_CHANNEL_3, DMA_MEMORY_TO_PERIPH, dma_id_13,  &dma_init_struct_spi_i2c };
-#if defined(MCU_SERIES_F7) && MICROPY_HW_HAS_SDCARD
+#if defined(MCU_SERIES_F7) && defined(SDMMC2) && MICROPY_HW_HAS_SDCARD
 const dma_descr_t dma_SDMMC_2_TX= { DMA2_Stream5, DMA_CHANNEL_11, DMA_MEMORY_TO_PERIPH, dma_id_13,  &dma_init_struct_sdio };
 #endif
 const dma_descr_t dma_SPI_6_RX = { DMA2_Stream6, DMA_CHANNEL_1, DMA_PERIPH_TO_MEMORY, dma_id_14,  &dma_init_struct_spi_i2c };