mb/hp: Get rid of whitespace before tab

Change-Id: I3f85e2ef0682b808f6e99dc406bccb88badcb82c
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/26623
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/mainboard/hp/8770w/devicetree.cb

@@ -37,7 +37,7 @@ chip northbridge/intel/sandybridge
 			subsystemid 0x103c 0x176c
 		end
 		device pci 01.0 on # PCIe Bridge for discrete graphics
-                	device pci 00.0 on end # GPU
+			device pci 00.0 on end # GPU
 			device pci 00.1 on end # HDMI Audio on GPU
 		end
 		device pci 02.0 off # Internal graphics VGA controller