chore(U0): add SPI support

Signed-off-by: Frederic Pillon <[email protected]>

Author: fpistm

libraries/SPI/src/utility/spi_com.c

@@ -30,7 +30,8 @@ uint32_t spi_getClkFreqInst(SPI_TypeDef *spi_inst)
 {
   uint32_t spi_freq = SystemCoreClock;
   if (spi_inst != NP) {
-#if defined(STM32C0xx) || defined(STM32F0xx) || defined(STM32G0xx)
+#if defined(STM32C0xx) || defined(STM32F0xx) || defined(STM32G0xx) || \
+    defined(STM32U0xx)
     /* SPIx source CLK is PCKL1 */
     spi_freq = HAL_RCC_GetPCLK1Freq();
 #else