Onsemi: Fix alignment of execute region to 8-byte boundary

--legacyalign, --no_legacyalign are deprecated from ARMC6 compiler, in order to
remove deprecated flags all linker files (GCC and IAR as well to have uniformity)
should strictly align to 8-byte boundary

Author: Deepika

targets/TARGET_ONSEMI/TARGET_NCS36510/device/TOOLCHAIN_GCC_ARM/NCS36510.ld

@@ -53,7 +53,7 @@ MEMORY {
     {
         __vector_table = .;
         KEEP(*(.vector_table))
-        . = ALIGN(4);
+        . = ALIGN(8);
     } > VECTORS
 
 
@@ -104,20 +104,20 @@ MEMORY {
         *(vtable)
         *(.data*)
 
-        . = ALIGN(4);
+        . = ALIGN(8);
         /* preinit data */
         PROVIDE_HIDDEN (__preinit_array_start = .);
         KEEP(*(.preinit_array))
         PROVIDE_HIDDEN (__preinit_array_end = .);
 
-        . = ALIGN(4);
+        . = ALIGN(8);
         /* init data */
         PROVIDE_HIDDEN (__init_array_start = .);
         KEEP(*(SORT(.init_array.*)))
         KEEP(*(.init_array))
         PROVIDE_HIDDEN (__init_array_end = .);
 
-        . = ALIGN(4);
+        . = ALIGN(8);
         /* finit data */
         PROVIDE_HIDDEN (__fini_array_start = .);
         KEEP(*(SORT(.fini_array.*)))