ftsmc020: move ftsmc020 static mem controller to driver/mtd

Move the header file and definitions of ftsmc020
static memory control unit from a320 SoC folder to
"drivers/mtd" folder.

This change will let other SoC which also use ftsmc020
could share the same header file.

Signed-off-by: Macpaul Lin <macpaul@andestech.com>
diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile
index 999431c..5a5ecdf 100644
--- a/drivers/mtd/Makefile
+++ b/drivers/mtd/Makefile
@@ -32,6 +32,7 @@
 COBJS-$(CONFIG_FLASH_CFI_DRIVER) += cfi_flash.o
 COBJS-$(CONFIG_FLASH_CFI_MTD) += cfi_mtd.o
 COBJS-$(CONFIG_HAS_DATAFLASH) += dataflash.o
+COBJS-$(CONFIG_FTSMC020) += ftsmc020.o
 COBJS-$(CONFIG_FLASH_CFI_LEGACY) += jedec_flash.o
 COBJS-$(CONFIG_MW_EEPROM) += mw_eeprom.o
 COBJS-$(CONFIG_SPEARSMI) += spr_smi.o