Revert "treewide: add sysupgrade comment for early DSA-adopters"

This reverts commit e81e625ca375d6dc3c885ec870ec15757ac76d72.

This was meant just for early DSA-adopters. Those should have
updated by now, remove it so future updaters get the intended
experience.

Signed-off-by: Adrian Schmutzler <[email protected]>

target/linux/kirkwood/image/Makefile

@@ -12,8 +12,7 @@ KERNEL_LOADADDR:=0x8000
 
 define Device/dsa-migration
   DEVICE_COMPAT_VERSION := 1.1
-  DEVICE_COMPAT_MESSAGE := Config cannot be migrated from swconfig to DSA \
-	(early adopters with DSA already set up may just force-flash keeping existing config)
+  DEVICE_COMPAT_MESSAGE := Config cannot be migrated from swconfig to DSA
 endef
 
 define Device/Default

target/linux/mvebu/image/cortexa9.mk

@@ -8,8 +8,7 @@
 
 define Device/dsa-migration
   DEVICE_COMPAT_VERSION := 1.1
-  DEVICE_COMPAT_MESSAGE := Config cannot be migrated from swconfig to DSA \
-	(early adopters with DSA already set up may just force-flash keeping existing config)
+  DEVICE_COMPAT_MESSAGE := Config cannot be migrated from swconfig to DSA
 endef
 
 define Device/buffalo_ls421de

target/linux/ramips/image/mt7621.mk

@@ -107,8 +107,7 @@ endef
 
 define Device/dsa-migration
   DEVICE_COMPAT_VERSION := 1.1
-  DEVICE_COMPAT_MESSAGE := Config cannot be migrated from swconfig to DSA \
-	(early adopters with DSA already set up may just force-flash keeping existing config)
+  DEVICE_COMPAT_MESSAGE := Config cannot be migrated from swconfig to DSA
 endef
 
 define Device/adslr_g7