ar71xx/mikrotik: disable unused MTD partitioning and split drivers

Reduces the compressed kernel size by ~2.5KB.

Signed-off-by: Gabor Juhos <juhosg@freemail.hu>

target/linux/ar71xx/mikrotik/config-default

@@ -223,6 +223,7 @@ CONFIG_LZO_DECOMPRESS=y
 # CONFIG_MARVELL_PHY is not set
 # CONFIG_MTD_CFI is not set
 CONFIG_MTD_CFI_I2=y
+# CONFIG_MTD_CMDLINE_PARTS is not set
 # CONFIG_MTD_CYBERTAN_PARTS is not set
 CONFIG_MTD_MAP_BANK_WIDTH_1=y
 CONFIG_MTD_MAP_BANK_WIDTH_4=y
@@ -233,10 +234,15 @@ CONFIG_MTD_NAND_ECC=y
 CONFIG_MTD_NAND_RB4XX=y
 CONFIG_MTD_NAND_RB750=y
 CONFIG_MTD_NAND_RB91X=y
+# CONFIG_MTD_OF_PARTS is not set
 # CONFIG_MTD_REDBOOT_PARTS is not set
 CONFIG_MTD_SPI_NOR_USE_4K_SECTORS=y
 # CONFIG_MTD_SPLIT_EVA_FW is not set
+# CONFIG_MTD_SPLIT_LZMA_FW is not set
+# CONFIG_MTD_SPLIT_SEAMA_FW is not set
 # CONFIG_MTD_SPLIT_TPLINK_FW is not set
+# CONFIG_MTD_SPLIT_UIMAGE_FW is not set
+# CONFIG_MTD_SPLIT_WRGG_FW is not set
 # CONFIG_MTD_TPLINK_PARTS is not set
 CONFIG_MTD_UBI=y
 CONFIG_MTD_UBI_BEB_LIMIT=20