fix(spi): Fix P4 SPI Pin definitions

Use GPIOs 36 or lower to avoid LDO power issues

Author: me-no-dev

cores/esp32/esp32-hal-spi.c

@@ -65,7 +65,7 @@
 #endif
 
 struct spi_struct_t {
-  spi_dev_t *dev;
+  volatile spi_dev_t *dev;
 #if !CONFIG_DISABLE_HAL_LOCKS
   SemaphoreHandle_t lock;
 #endif

variants/esp32p4/pins_arduino.h

@@ -22,10 +22,11 @@ static const uint8_t RX = 38;
 static const uint8_t SDA = 7;
 static const uint8_t SCL = 8;
 
-static const uint8_t SS = 27;
-static const uint8_t MOSI = 46;
-static const uint8_t MISO = 47;
-static const uint8_t SCK = 48;
+// Use GPIOs 36 or lower on the P4 DevKit to avoid LDO power issues with high numbered GPIOs.
+static const uint8_t SS = 26;
+static const uint8_t MOSI = 32;
+static const uint8_t MISO = 33;
+static const uint8_t SCK = 36;
 
 static const uint8_t A0 = 16;
 static const uint8_t A1 = 17;