Reduce hello_world footprint to fit in 8kB

When building with yosys we assume hello_world fits in 8kB. There's
enough free space that we can adjust the linker script to make it fit.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>

hello_world/hello_world.hex

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hello_world/powerpc.lds

@@ -7,7 +7,7 @@ SECTIONS
  	}
 	. = 0x1000;
 	.text : { *(.text) }
-	. = 0x2000;
+	. = 0x1800;
 	.data : { *(.data) }
 	.bss : { *(.bss) }
 }