Fix PLL2 configuration for ADC

Author: manchoz

targets/TARGET_STM/TARGET_STM32H7/analogin_device.c

@@ -36,9 +36,9 @@ void analogin_pll_configuration(void)
 
     RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
     PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_ADC;
-    PeriphClkInitStruct.PLL2.PLL2M = 4;
-    PeriphClkInitStruct.PLL2.PLL2N = 240;
-    PeriphClkInitStruct.PLL2.PLL2P = 2;
+    PeriphClkInitStruct.PLL2.PLL2M = 32;
+    PeriphClkInitStruct.PLL2.PLL2N = 120;
+    PeriphClkInitStruct.PLL2.PLL2P = 6;
     PeriphClkInitStruct.PLL2.PLL2Q = 2;
     PeriphClkInitStruct.PLL2.PLL2R = 2;
     PeriphClkInitStruct.PLL2.PLL2RGE = RCC_PLL2VCIRANGE_1;