drivers: flash: Align NXP flash drivers on parameter checking

Parameter checking of flash read API expects checking for len == 0
before checking dest buffer validation.

Fixes #87021

Signed-off-by: David Leach <david.leach@nxp.com>

drivers/flash/flash_mcux_flexspi_hyperflash.c

@@ -395,6 +395,14 @@ static int flash_flexspi_hyperflash_read(const struct device *dev, off_t offset,
 {
 	struct flash_flexspi_hyperflash_data *data = dev->data;
 
+	if (len == 0) {
+		return 0;
+	}
+
+	if (!buffer) {
+		return -EINVAL;
+	}
+
 	uint8_t *src = memc_flexspi_get_ahb_address(&data->controller,
 			data->port,
 			offset);

drivers/flash/flash_mcux_flexspi_mx25um51345g.c

@@ -361,6 +361,15 @@ static int flash_flexspi_nor_read(const struct device *dev, off_t offset,
 		void *buffer, size_t len)
 {
 	struct flash_flexspi_nor_data *data = dev->data;
+
+	if (len == 0) {
+		return 0;
+	}
+
+	if (!buffer) {
+		return -EINVAL;
+	}
+
 	uint8_t *src = memc_flexspi_get_ahb_address(data->controller,
 						    data->port,
 						    offset);

drivers/flash/flash_mcux_flexspi_nor.c

@@ -325,6 +325,10 @@ static int flash_flexspi_nor_read(const struct device *dev, off_t offset,
 {
 	struct flash_flexspi_nor_data *data = dev->data;
 
+	if (len == 0) {
+		return 0;
+	}
+
 	if (!buffer) {
 		return -EINVAL;
 	}

drivers/flash/flash_nxp_s32_qspi.c

@@ -59,6 +59,10 @@ int nxp_s32_qspi_read(const struct device *dev, off_t offset, void *dest, size_t
 	Qspi_Ip_StatusType status;
 	int ret = 0;
 
+	if (size == 0) {
+		return 0;
+	}
+
 	if (!dest) {
 		return -EINVAL;
 	}