mb/trulo/var/pujjolo: Enable s0ix function

Set s0ix_enable to true.

BUG=b:395763555
BRANCH=none
TEST=Build and boot to pujjolo. Verify functions work.

Change-Id: I69eff7c54e3c46549cd47e7c9413a9c0b978783d
Signed-off-by: Luca Lai <luca.lai@lcfc.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/88020
Reviewed-by: Eric Lai <ericllai@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jayvik Desai <jayvik@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>

src/mainboard/google/brya/variants/pujjolo/overridetree.cb

@@ -11,6 +11,9 @@ fw_config
 end
 chip soc/intel/alderlake
 
+	# S0ix enable
+	register "s0ix_enable" = "true"
+
 	# Acoustic settings
 	register "acoustic_noise_mitigation" = "1"
 	register "slow_slew_rate[VR_DOMAIN_IA]" = "SLEW_FAST_8"