m68k: Drop CONFIG_MTD_M25P80 in stmark2_defconfig

Drop CONFIG_MTD_M25P80 that was removed 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: Greg Ungerer <gerg@linux-m68k.org>

arch/m68k/configs/stmark2_defconfig

@@ -48,7 +48,6 @@ CONFIG_MTD_CFI_STAA=y
 CONFIG_MTD_ROM=y
 CONFIG_MTD_COMPLEX_MAPPINGS=y
 CONFIG_MTD_PLATRAM=y
-CONFIG_MTD_M25P80=y
 CONFIG_MTD_SPI_NOR=y
 # CONFIG_INPUT_KEYBOARD is not set
 # CONFIG_INPUT_MOUSE is not set