xen/arm: linker: Indent correctly _stext

_stext is indented by one space more compare to the lines. This doesn't
seem warrant, so delete the extra space.

Signed-off: Julien Grall <jgrall@amazon.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>

xen/arch/arm/xen.lds.S

@@ -31,7 +31,7 @@ SECTIONS
   . = XEN_VIRT_START;
   _start = .;
   .text : {
-        _stext = .;            /* Text section */
+       _stext = .;             /* Text section */
        *(.text.header)
 
        *(.text.cold)