AMD hudson yangtze: Fix corruption of a global ramstage variable

A late for loop may reference over the current array allocation
and corrupt an unrelated global variable. As a quick fix bumb the
size of the array allocation uniformly to 6.

We missed these boards for commit 9c7d73ca because the arrays
had been renamed.

Change-Id: Iff2f2a0090d9302576bc72195d2a3f6fa37ce29a
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3954
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-by: Bruce Griffith <Bruce.Griffith@se-eng.com>

src/mainboard/amd/parmer/mptable.c

@@ -30,7 +30,7 @@
 
 //-#define IO_APIC_ID    CONFIG_MAX_PHYSICAL_CPUS + 1
 #define IO_APIC_ID    CONFIG_MAX_CPUS
-extern u8 bus_hudson[3];
+extern u8 bus_hudson[6];
 
 extern u32 bus_type[256];
 extern u32 sbdn_hudson;