board/pc/genimage-bios.cfg: beautify file

Beatify this genimage .cfg file to have consistency with all genimage .cfg
files in Buildroot.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

board/pc/genimage-bios.cfg

@@ -1,24 +1,22 @@
 image disk.img {
+	hdimage {
+	}
 
-  hdimage {
-  }
+	partition boot {
+		in-partition-table = "no"
+		image = "boot.img"
+		offset = 0
+		size = 512
+	}
 
-  partition boot {
-    in-partition-table = "no"
-    image = "boot.img"
-    offset = 0
-    size = 512
-  }
-
-  partition grub {
-    in-partition-table = "no"
-    image = "grub.img"
-    offset = 512
-  }
-
-  partition root {
-    partition-type = 0x83
-    image = "rootfs.ext2"
-  }
+	partition grub {
+		in-partition-table = "no"
+		image = "grub.img"
+		offset = 512
+	}
 
+	partition root {
+		partition-type = 0x83
+		image = "rootfs.ext2"
+	}
 }