[coreboot] [patch] The correct way to calculate the cores in AMD fam10

[Bao, Zheng]

The number of cores is got by reading the bit 15,13,12 of [0,24,3,e8].
The bit 15 seems to be a new feature when CPU started to have more that
4
cores.

Signed-off-by: Zheng Bao

Index: src/northbridge/amd/amdht/h3ncmn.c
===================================================================
--- src/northbridge/amd/amdht/h3ncmn.c	(revision 5679)
+++ src/northbridge/amd/amdht/h3ncmn.c	(working copy)
@@ -555,16 +555,17 @@
    u8 i;

ASSERT((node < nb->maxNodes));
-	/* Read CmpCap */
+	/* Read CmpCap [2][1:0] */
    AmdPCIReadBits(MAKE_SBDFO(makePCISegmentFromNode(node),
    			makePCIBusFromNode(node),
    			makePCIDeviceFromNode(node),
    			CPU_NB_FUNC_03,
    			REG_NB_CAPABILITY_3XE8),
-				13, 12, &temp);
+				15, 12, &temp);

+	/* bit[15,13,12] composes the cores */
    /* Support Downcoring */
-	cores = temp + 1;
+	cores = ((temp & 8) >> 1) + (temp & 3) + 1;
    AmdPCIReadBits (MAKE_SBDFO(makePCISegmentFromNode(node),
    				makePCIBusFromNode(node),
    				makePCIDeviceFromNode(node),