Update package test to define boot_flash in linker scripts

Author: domin144

packagetest/Inputs/microbit.ld

@@ -1,7 +1,9 @@
-__flash = 0x00000000;   /* starting address of flash */
-__flash_size = 0x40000; /* length of flash */
-__ram = 0x20000000;     /* starting address of RAM bank 0 */
-__ram_size = 0x4000;    /* length of RAM bank 0 */
+__boot_flash = 0x00000000;  /* fragment of the flash where interrupt vector goes */
+__boot_flash_size = 0x1000; /* length of flash fragment with interrupt vector */
+__flash = 0x00001000;       /* starting address of the remaining flash */
+__flash_size = 0x3f000;     /* length of the remaining flash */
+__ram = 0x20000000;         /* starting address of RAM bank 0 */
+__ram_size = 0x4000;        /* length of RAM bank 0 */
 __stack_size = 512;
 
 INCLUDE picolibcpp.ld