bl_update: ensure amj update file is padded

use alignment of 32 to ensure it works with all MCUs

Author: tridge

bl_update/ldscript_bl.ld

@@ -79,6 +79,7 @@ SECTIONS
     KEEP (*(SORT(.fini_array.*)))
     KEEP (*(.fini_array*))
     PROVIDE_HIDDEN (__fini_array_end = .);
+    . = ALIGN(32);
   } >FLASH
 
   /* used by the startup to initialize data */
@@ -87,12 +88,12 @@ SECTIONS
   /* Initialized data sections goes into RAM, load LMA copy after code */
   .data : 
   {
-    . = ALIGN(4);
+    . = ALIGN(32);
     _sdata = .;        /* create a global symbol at data start */
     *(.data)           /* .data sections */
     *(.data*)          /* .data* sections */
 
-    . = ALIGN(4);
+    . = ALIGN(32);
     _edata = .;        /* define a global symbol at data end */
   } >RAM AT> FLASH