Add config for using S0ix

S0ix does not require eSPI, and eSPI does not mandate S0ix.

Enable S0ix for:

- darp7 (TGL-U)
- darp8 (ADL-P)
- galp5 (TGL-U)
- galp6 (ADL-P)
- lemp10 (TGL-U)
- lemp11 (ADL-U)

It is also currently enabled on ADL-H due to a bug with S3:

- gaze17-3050
- gaze17-3060-b
- oryp9

Signed-off-by: Tim Crawford <tcrawford@system76.com>

src/board/system76/lemp11/board.mk

@@ -5,6 +5,9 @@ EC=it5570e
 # Enable eSPI
 CFLAGS+=-DEC_ESPI=1
 
+# Use S0ix
+CFLAGS+=-DUSE_S0IX=1
+
 # Include keyboard
 KEYBOARD=14in_83