sh: Replace CONFIG_MTD_M25P80 with CONFIG_MTD_SPI_NOR in sh7757lcr_defconfig

CONFIG_MTD_M25P80 was removed and replaced by CONFIG_MTD_SPI_NOR in
commit b35b9a10 ("mtd: spi-nor: Move m25p80 code in spi-nor.c")
Signed-off-by: Bin Meng <bin.meng@windriver.com>
Signed-off-by: Rich Felker <dalias@libc.org>

arch/sh/configs/sh7757lcr_defconfig

@@ -36,7 +36,7 @@ CONFIG_IPV6=y
 # CONFIG_FW_LOADER is not set
 CONFIG_MTD=y
 CONFIG_MTD_BLOCK=y
-CONFIG_MTD_M25P80=y
+CONFIG_MTD_SPI_NOR=y
 CONFIG_BLK_DEV_RAM=y
 CONFIG_SCSI=y
 CONFIG_BLK_DEV_SD=y