ramips: mt7621: switch trx parser to parser_trx from mtdsplit

Switch trx parser to parser_trx of Linux Kernel from mtdsplit_trx to
split firmware partition using model-specific trx magic number on
some Buffalo devices.
This change is tested on Buffalo WSR-2533DHPL.

Signed-off-by: INAGAKI Hiroshi <[email protected]>

target/linux/ramips/dts/mt7621_buffalo_wsr-1166dhp.dts

@@ -155,7 +155,7 @@
 			};
 
 			partition@50000 {
-				compatible = "openwrt,trx";
+				compatible = "brcm,trx";
 				label = "firmware";
 				reg = <0x50000 0xf90000>;
 			};

target/linux/ramips/dts/mt7621_buffalo_wsr-2533dhpl.dts

@@ -159,7 +159,7 @@
 			};
 
 			partition@50000 {
-				compatible = "openwrt,trx";
+				compatible = "brcm,trx";
 				label = "firmware";
 				reg = <0x50000 0x7c0000>;
 			};

target/linux/ramips/mt7621/config-6.6

@@ -161,6 +161,7 @@ CONFIG_MTD_NAND_ECC_SW_HAMMING=y
 CONFIG_MTD_NAND_MT7621=y
 CONFIG_MTD_NAND_MTK_BMT=y
 # CONFIG_MTD_PARSER_TPLINK_SAFELOADER is not set
+CONFIG_MTD_PARSER_TRX=y
 CONFIG_MTD_PHYSMAP=y
 CONFIG_MTD_RAW_NAND=y
 CONFIG_MTD_ROUTERBOOT_PARTS=y
@@ -171,7 +172,6 @@ CONFIG_MTD_SPLIT_FIT_FW=y
 CONFIG_MTD_SPLIT_MINOR_FW=y
 CONFIG_MTD_SPLIT_SEAMA_FW=y
 CONFIG_MTD_SPLIT_TPLINK_FW=y
-CONFIG_MTD_SPLIT_TRX_FW=y
 CONFIG_MTD_SPLIT_UIMAGE_FW=y
 CONFIG_MTD_UBI=y
 CONFIG_MTD_UBI_BEB_LIMIT=20