MAINTAINERS: update X86 PLATFORM DRIVERS entry with new kernel.org git repo

The pdx86 maintainers have moved their git tree from infradead.org to
kernel.org, update the X86 PLATFORM DRIVERS MAINTAINERS entry for this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index edd2b19..2a2170f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18861,7 +18861,7 @@
 M:	Mark Gross <mgross@linux.intel.com>
 L:	platform-driver-x86@vger.kernel.org
 S:	Maintained
-T:	git git://git.infradead.org/linux-platform-drivers-x86.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git
 F:	drivers/platform/olpc/
 F:	drivers/platform/x86/