Asus F2A85-M: Fix the _CRS PCI0 bus info

On Asus F2A85-M, the Linux kernel complains that the _CRS method does
not specify the number of PCI busses.

    [FIRMWARE BUG]: ACPI: no secondary bus range in _CRS

Just put there 256. This should be part of re-factoring of the whole
ACPI stuff.

The same change was already done for the AMD Brazos (SB800) boards,
based on commit »Persimmon DSDT: Add secondary bus range to PCI0«
(4733c647) [1].

[1] http://review.coreboot.org/2592

Change-Id: I06f90ec353df9198a20b2165741ea0fe94071266
Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Reviewed-on: http://review.coreboot.org/3320
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martin.roth@se-eng.com>
Reviewed-by: David Hubbard <david.c.hubbard+coreboot@gmail.com>

src/mainboard/asus/f2a85-m/dsdt.asl

@@ -1334,6 +1334,22 @@ DefinitionBlock (
 			} /* end Ac97modem */
 
 			Name(CRES, ResourceTemplate() {
+				/* Set the Bus number and Secondary Bus number for the PCI0 device
+				 * The Secondary bus range for PCI0 lets the system
+				 * know what bus values are allowed on the downstream
+				 * side of this PCI bus if there is a PCI-PCI bridge.
+				 * PCI busses can have 256 secondary busses which
+				 * range from [0-0xFF] but they do not need to be
+				 * sequential.
+				*/
+				WordBusNumber (ResourceProducer, MinFixed, MaxFixed, PosDecode,
+					0x0000,		/* address granularity */
+					0x0000,		/* range minimum */
+					0x00FF,		/* range maximum */
+					0x0000,		/* translation */
+					0x0100,		/* length */
+					,, PSB0)	/* ResourceSourceIndex, ResourceSource, DescriptorName */
+
 				IO(Decode16, 0x0CF8, 0x0CF8, 1,	8)
 
 				WORDIO(ResourceProducer, MinFixed, MaxFixed, PosDecode, EntireRange,