mb/google/nissa/var/pujjo: Add WWAN power off sequence

pujjo support FM101 WWAN, use wwan_power.asl to handle the 
power off sequence

BUG=b:238281124
TEST=Build and boot on pujjo

Signed-off-by: Stanley Wu <stanley1.wu@lcfc.corp-partner.google.com>
Change-Id: I53cd45c8030855c267d870d68d009c454350621e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65781
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Reka Norman <rekanorman@chromium.org>

src/mainboard/google/brya/Kconfig.name

@@ -251,6 +251,7 @@ config BOARD_GOOGLE_PUJJO
 	select BOARD_GOOGLE_BASEBOARD_NISSA
 	select DRIVERS_GENERIC_GPIO_KEYS
 	select DRIVERS_GENESYSLOGIC_GL9750
+	select HAVE_WWAN_POWER_SEQUENCE
 
 config BOARD_GOOGLE_XIVU
 	bool "->  Xivu"

src/mainboard/google/brya/variants/pujjo/include/variant/gpio.h

@@ -5,4 +5,8 @@
 
 #include <baseboard/gpio.h>
 
+#define WWAN_FCPO	GPP_D6
+#define WWAN_RST	GPP_F12
+#define T2_OFF_MS	20
+
 #endif