fwk: tulip: assert GPU_PWR_LEVEL low only for AC-only mode

Previously, the EC always pulled it low on force_update,
causing NV Diag to fail in shell mode.
Now GPIO is pulled low only under AC-only condition.
0x3E07 (pull low)-> enter shell mode -> run NV diag (keep low).

BRANCH=fwk-tulip-29169
BUG=NVDiag Test Fail_Error Code = 000000000818
TEST= 1. AC only(100w/180w/240) can power on
2. Run the NVDiag Test not show the error code

Signed-off-by: johnwc_yeh <JohnWC_Yeh@compal.com>

Author: JohnWC-Yeh

zephyr/program/framework/lotus/src/cpu_power.c

@@ -475,7 +475,7 @@ void update_soc_power_limit(bool force_update, bool force_no_adapter)
 		set_gpu_gpio(GPIO_FUNC_ACDC, 1);
 #endif
 
-	if (force_update)
+	if (force_update && !with_dc)
 		set_nv_gpu_throttle(THROTTLE_ON, 0);
 
 	if (mode_ctl)