gigabyte/ga_2761gxdk: Remove comment *endif*

After the indentation is fixed in commit *mainboard: Format
irq_tables.c* [1], the comment is redundant. So remove it.

[1] Change-Id: If254723f3013377fb3b9b08dd5eca6b76730ec4a

Change-Id: Iebbcf10ee3cef1b4cf60ea34a6b3ad51e2208671
Reviewed-on: https://review.coreboot.org/15933
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/mainboard/gigabyte/ga_2761gxdk/irq_tables.c

@@ -134,7 +134,7 @@ unsigned long write_pirq_routing_table(unsigned long addr)
 
 			for (i = 0; i < 8; i++)
 				pci_write_config8(dev, reg[i], irq[i]);
-		}		// endif
+		}
 
 		printk(BIOS_DEBUG, "Setting Onboard SiS Southbridge\n");