x86, AMD IOMMU: ignore detection of GART IOMMU
x86, AMD IOMMU: ignore detection of GART IOMMU

One of the last IOMMU updates covered a bug in the AMD IOMMU code. The early
detection code does not succeed if the GART is already detected. This patch
fixes this.

Cc: Robert Richter <22a70fd9773e4de05b12c05075e9bcd605577f4d@amd.com>
Cc: Bhavna Sarathy <c0bd168c69c5d9268fa595df988da5fa852c0e66@amd.com>
Signed-off-by: Joerg Roedel <ebd221a096cbc71dd9e1991db28795933c85f380@amd.com>
Cc: d4d3187dbcba3fb2e2e25a4ce499c8e441b6817d@lists.linux-foundation.org
Cc: Joerg Roedel <ebd221a096cbc71dd9e1991db28795933c85f380@amd.com>
Cc: Robert Richter <22a70fd9773e4de05b12c05075e9bcd605577f4d@amd.com>
Cc: Bhavna Sarathy <c0bd168c69c5d9268fa595df988da5fa852c0e66@amd.com>
Signed-off-by: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@elte.hu>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas