stm32mp-t1000: Fix clock configuration

Fix some overclocking for SAI interfaces. Also some clock
configurations are improved. Changed clocks are:

- SAI1 to SAI4
- UART1
- UART78
- SDMMC3

fdts/stm32mp-som-t1000.dtsi

@@ -123,23 +123,23 @@
         CLK_SPI45_HSI
         CLK_SPI6_HSI
         CLK_I2C46_HSI
-        CLK_SDMMC3_PLL4P
+        CLK_SDMMC3_HCLK2
         CLK_USBO_USBPHY
         CLK_ADC_CKPER
         CLK_CEC_LSE
         CLK_I2C12_HSI
         CLK_I2C35_HSI
-        CLK_UART1_HSI
+        CLK_UART1_HSE
         CLK_UART24_PCLK1
         CLK_UART35_HSI
         CLK_UART6_PCLK2
-        CLK_UART78_HSI
+        CLK_UART78_PCLK1
         CLK_SPDIF_PLL3Q
         CLK_FDCAN_HSE
-        CLK_SAI1_PLL3Q
-        CLK_SAI2_PLL3Q
-        CLK_SAI3_PLL3Q
-        CLK_SAI4_PLL3Q
+        CLK_SAI1_PLL4Q
+        CLK_SAI2_PLL4Q
+        CLK_SAI3_PLL4Q
+        CLK_SAI4_PLL4Q
         CLK_RNG1_CSI
         CLK_RNG2_CSI
         CLK_LPTIM1_PCLK1