Fix serial speed DD configuration & migrate keyboards (#25546)

* Fix serial speed DD configuration

- Fixes incorrect SOFT_SERIAL_SPEED mapping
- Renames key split.soft_serial_speed -> split.serial.speed
- Migrates keyoards that configure this, and remove configuration from keyboards that do not differ from the default behaviour
- Add deprecation notice and migration support

2 files changed, 0 insertions, 20 deletions

diff --git a/keyboards/omkbd/ergodash/mini/config.h b/keyboards/omkbd/ergodash/mini/config.h
index 12b408ff56..373c238afd 100644
--- a/keyboards/omkbd/ergodash/mini/config.h
+++ b/keyboards/omkbd/ergodash/mini/config.h
@@ -19,13 +19,3 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
 
 #define AUDIO_PIN C6
-
-#define SELECT_SOFT_SERIAL_SPEED 1
-/*Sets the protocol speed when using serial communication*/
-//Speeds:
-//0: about 189kbps (Experimental only)
-//1: about 137kbps (default)
-//2: about 75kbps
-//3: about 39kbps
-//4: about 26kbps
-//5: about 20kbps
diff --git a/keyboards/omkbd/ergodash/rev1/config.h b/keyboards/omkbd/ergodash/rev1/config.h
index 12b408ff56..373c238afd 100644
--- a/keyboards/omkbd/ergodash/rev1/config.h
+++ b/keyboards/omkbd/ergodash/rev1/config.h
@@ -19,13 +19,3 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
 
 #define AUDIO_PIN C6
-
-#define SELECT_SOFT_SERIAL_SPEED 1
-/*Sets the protocol speed when using serial communication*/
-//Speeds:
-//0: about 189kbps (Experimental only)
-//1: about 137kbps (default)
-//2: about 75kbps
-//3: about 39kbps
-//4: about 26kbps
-//5: about 20kbps