sb/amd/sr5650: Use 32 bit integers when disabling ports

This function attempts to set bits in the 20s of state and state_save,
which won't work since those variables are only 16 bits wide. Extend
them to 32 bits to capture all the bit operations.

Change-Id: I5616a2d879a85ff5f57af5af20384516659c62d6
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Found-by: Coverity CID 1347384
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33457
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/southbridge/amd/sr5650/pcie.c

@@ -59,11 +59,11 @@ static void PciePowerOffGppPorts(struct device *nb_dev, struct device *dev, u32
 {
 	printk(BIOS_DEBUG, "PciePowerOffGppPorts() port %d\n", port);
 	u32 reg;
-	u16 state_save;
+	u32 state_save;
 	uint8_t i;
 	struct southbridge_amd_sr5650_config *cfg =
 		(struct southbridge_amd_sr5650_config *)nb_dev->chip_info;
-	u16 state = cfg->port_enable;
+	u32 state = cfg->port_enable;
 
 	if (!(AtiPcieCfg.Config & PCIE_DISABLE_HIDE_UNUSED_PORTS))
 		state &= AtiPcieCfg.PortDetect;