fix(bw): Restart from bootloader on F4 targets (#4434)

radio/src/boards/generic_stm32/startup/startup_stm32f40_41xxx.s

@@ -60,7 +60,6 @@ defined in linker script */
   .type  Reset_Handler, %function
 Reset_Handler:  
   ldr   sp, =_estack    /* set stack pointer */
-  bl pwrResetHandler    /* jump to soft power control as soon as possible */
 
 /* Copy the data segment initializers from flash to SRAM */
   ldr r0, =_sdata
@@ -79,6 +78,9 @@ LoopCopyDataInit:
   cmp r4, r1
   bcc CopyDataInit
 
+/* jump to soft power control as soon as possible */
+  bl pwrResetHandler
+
 /* Zero fill the bss segment. */  
   ldr  r2, =_sbss
   ldr r4, =_ebss