Revert "spd.c: Remove dead assignment"

This reverts commit e3cfbc0c70254a78bce48019658eb4fefb05fe5f.

Reason for revert: uninitialized parameter
 
This line "pci_conf_read(0, smbdev, smbfun, 0x08, 1, &x);" is needed to initialize 'x'

Change-Id: I8ccd8cce89dfa29f3313a98e6a3de6a6f0ee1d1d
Reviewed-on: https://review.coreboot.org/c/memtest86plus/+/36725
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/spd.c b/spd.c
index 053db3c..d30e3e2 100644
--- a/spd.c
+++ b/spd.c
@@ -76,6 +76,8 @@
 	unsigned long x;
 	int result;
 
+	result = pci_conf_read(0, smbdev, smbfun, 0x08, 1, &x);
+
 	if (x < 0x40) {
 		// SB600/700
 		result = pci_conf_read(0, smbdev, smbfun, 0x90, 2, &x);