Fix possible overflow of .data region in FLASH

Author: Guilucand

cortex-m-rt/link.x.in

@@ -106,14 +106,14 @@ SECTIONS
 
   /* ## Sections in RAM */
   /* ### .data */
-  .data : AT(__erodata) ALIGN(4)
+  .data : ALIGN(4)
   {
     . = ALIGN(4);
     __sdata = .;
     *(.data .data.*);
     . = ALIGN(4); /* 4-byte align the end (VMA) of this section */
     __edata = .;
-  } > RAM
+  } > RAM AT>FLASH
 
   /* LMA of .data */
   __sidata = LOADADDR(.data);