fix(PeriphDrivers): Fix clock speed configuration of SPI3 for MAX32650 (#1566)

MAX32650 SPI driver assumes the SPI3 peripheral clock is twice the frequency as other SPI instances
even though there is no such indication in the user guide.

Author: cameronpacileo-adi

Libraries/PeriphDrivers/Source/SPI/spi_me10.c

@@ -123,9 +123,7 @@ int MXC_SPI_ReadyForSleep(mxc_spi_regs_t *spi)
 /* ************************************************************************ */
 int MXC_SPI_GetPeripheralClock(mxc_spi_regs_t *spi)
 {
-    if (MXC_SPI_GET_IDX(spi) == 3) {
-        return PeripheralClock * 2;
-    } else if (MXC_SPI_GET_IDX(spi) != -1) {
+    if (MXC_SPI_GET_IDX(spi) != -1) {
         return PeripheralClock;
     } else {
         return E_BAD_PARAM;