Add sketch boot section to linked script

Author: sandeepmistry

variants/mkrfox1200/linker_scripts/gcc/flash_with_bootloader.ld

@@ -67,6 +67,9 @@ SECTIONS
 	{
 		__text_start__ = .;
 
+		KEEP(*(.sketch_boot))
+
+		. = ALIGN(0x2000);
 		KEEP(*(.isr_vector))
 		*(.text*)