ath79: enable elf mtd splitter

Enabled the ELF firmware partition splitter 4.19 and 5.4 in preparation
for the TP-Link EAP245v3 device support.

Signed-off-by: Sander Vanheule <[email protected]>

target/linux/ath79/config-4.19

@@ -168,6 +168,7 @@ CONFIG_MTD_M25P80=y
 CONFIG_MTD_PARSER_CYBERTAN=y
 CONFIG_MTD_PHYSMAP=y
 CONFIG_MTD_SPI_NOR=y
+CONFIG_MTD_SPLIT_ELF_FW=y
 CONFIG_MTD_SPLIT_LZMA_FW=y
 CONFIG_MTD_SPLIT_SEAMA_FW=y
 CONFIG_MTD_SPLIT_TPLINK_FW=y

target/linux/ath79/config-5.4

@@ -175,6 +175,7 @@ CONFIG_MTD_CMDLINE_PARTS=y
 CONFIG_MTD_PARSER_CYBERTAN=y
 CONFIG_MTD_PHYSMAP=y
 CONFIG_MTD_SPI_NOR=y
+CONFIG_MTD_SPLIT_ELF_FW=y
 CONFIG_MTD_SPLIT_LZMA_FW=y
 CONFIG_MTD_SPLIT_SEAMA_FW=y
 CONFIG_MTD_SPLIT_TPLINK_FW=y