ramips: rt3883: drop jimage support

The splitter isn't required by any of the boards in the subtarget.

Signed-off-by: Mathias Kresin <[email protected]>

target/linux/ramips/rt3883/config-4.14

@@ -149,7 +149,6 @@ CONFIG_MTD_PHYSMAP=y
 CONFIG_MTD_SPI_NOR=y
 CONFIG_MTD_SPI_NOR_USE_4K_SECTORS=y
 CONFIG_MTD_SPI_NOR_USE_4K_SECTORS_LIMIT=16384
-CONFIG_MTD_SPLIT_JIMAGE_FW=y
 CONFIG_MTD_SPLIT_SEAMA_FW=y
 CONFIG_MTD_SPLIT_UIMAGE_FW=y
 CONFIG_NEED_DMA_MAP_STATE=y