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/common/peci.c

@@ -10,6 +10,10 @@
 #include <ec/gpio.h>
 #include <ec/pwm.h>
 
+#ifndef USE_S0IX
+    #define USE_S0IX 0
+#endif
+
 // Fan speed is the lowest requested over HEATUP seconds
 #ifndef BOARD_HEATUP
     #define BOARD_HEATUP 4
@@ -122,13 +126,13 @@ int16_t peci_wr_pkg_config(uint8_t index, uint16_t param, uint32_t data) {
 uint8_t peci_get_fan_duty(void) {
     uint8_t duty;
 
-#if EC_ESPI
+#if USE_S0IX
     // Use PECI if CPU is not in C10 state
     peci_on = gpio_get(&CPU_C10_GATE_N);
-#else // EC_ESPI
+#else // USE_S0IX
     // Use PECI if in S0 state
     peci_on = power_state == POWER_STATE_S0;
-#endif // EC_ESPI
+#endif // USE_S0IX
 
     if (peci_on) {
         // Wait for completion