mtd: spi-nor: Stop exporting spi_nor_restore()

Some SPI NOR controllers that used this method were moved to
drivers/spi/. We don't accept new support for the existing SPI NOR
controllers drivers under drivers/mtd/spi-nor/controllers/ and we
encourage their owners to move the drivers under drivers/spi/.
Make spi_nor_restore() private as we're going to use it just in core.c.

Link: https://lore.kernel.org/r/20230331074606.3559258-8-tudor.ambarus@linaro.org
Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>

Documentation/driver-api/mtd/spi-nor.rst

@@ -63,6 +63,3 @@ The main API is spi_nor_scan(). Before you call the hook, a driver should
 initialize the necessary fields for spi_nor{}. Please see
 drivers/mtd/spi-nor/spi-nor.c for detail. Please also refer to spi-fsl-qspi.c
 when you want to write a new driver for a SPI NOR controller.
-Another API is spi_nor_restore(), this is used to restore the status of SPI
-flash chip such as addressing mode. Call it whenever detach the driver from
-device or reboot the system.

drivers/mtd/spi-nor/core.c

@@ -3291,7 +3291,7 @@ static void spi_nor_put_device(struct mtd_info *mtd)
 	module_put(dev->driver->owner);
 }
 
-void spi_nor_restore(struct spi_nor *nor)
+static void spi_nor_restore(struct spi_nor *nor)
 {
 	int ret;
 
@@ -3311,7 +3311,6 @@ void spi_nor_restore(struct spi_nor *nor)
 	if (nor->flags & SNOR_F_SOFT_RESET)
 		spi_nor_soft_reset(nor);
 }
-EXPORT_SYMBOL_GPL(spi_nor_restore);
 
 static const struct flash_info *spi_nor_match_name(struct spi_nor *nor,
 						   const char *name)

include/linux/mtd/spi-nor.h

@@ -450,10 +450,4 @@ static inline struct device_node *spi_nor_get_flash_node(struct spi_nor *nor)
 int spi_nor_scan(struct spi_nor *nor, const char *name,
 		 const struct spi_nor_hwcaps *hwcaps);
 
-/**
- * spi_nor_restore_addr_mode() - restore the status of SPI NOR
- * @nor:	the spi_nor structure
- */
-void spi_nor_restore(struct spi_nor *nor);
-
 #endif