AMD Hudson boards: Use hudson.h for pm_ioread and delete pmio.h

Unfortunately, an unneeded mainboard specific `pmio.h` was created
when merging the AMD Parmer and Thatcher ports.

Rudolf used the header from a more generic location

    southbridge/amd/agesa/hudson/hudson.h

doing the the ASUS F2A85-M port, but did not delete the `pmio.h`
now unused `pmio.h` header file.

So adapt AMD Parmer and Thatcher to use the Hudson one as done for
the ASUS F2A85-M and delete the now unused mainboard specific header
file `pmio.h` to avoid duplication.

Change-Id: I961cd145ebc3b83e31c638ac453ac95ee19c18db
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/2958
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martin.roth@se-eng.com>

src/mainboard/amd/parmer/mptable.c

@@ -24,9 +24,9 @@
 #include <string.h>
 #include <stdint.h>
 #include <cpu/amd/amdfam15.h>
-#include "pmio.h"
 #include <arch/cpu.h>
 #include <cpu/x86/lapic.h>
+#include "southbridge/amd/agesa/hudson/hudson.h" /* pm_ioread() */
 
 //-#define IO_APIC_ID    CONFIG_MAX_PHYSICAL_CPUS + 1
 #define IO_APIC_ID    CONFIG_MAX_CPUS