mcu/pic32: Add image_header region

This add dependency to mgmt/image_header package
that provides dummy image header so elf file can
be loaded to device without creating the image with newt tool.
This image header is then replaced by newt tool.

hw/mcu/microchip/pic32mz/p32mz_app.ld

@@ -117,6 +117,7 @@ MEMORY
 {
   kseg1_boot_mem              : ORIGIN = 0x9FC00000, LENGTH = 0x480
   kseg1_boot_mem_4B0          : ORIGIN = 0xBFC004B0, LENGTH = 0xA50
+  kseg0_image_header_mem (r)  : ORIGIN = 0x9D000000, LENGTH = 0x20
   INCLUDE p32mz_app_mem.ld
   config_BFC0FF40             : ORIGIN = 0xBFC0FF40, LENGTH = 0x4
   config_BFC0FF44             : ORIGIN = 0xBFC0FF44, LENGTH = 0x4
@@ -695,6 +696,10 @@ SECTIONS
     KEEP(*(.boot_reset))
   } > kseg1_boot_mem
   /* Boot Sections */
+  .image_header :
+  {
+      KEEP(*(.image_header*))      /* Image header */
+  } > kseg0_image_header_mem
   .reset :
   {
     _app_reset = .;

hw/mcu/microchip/pic32mz/pkg.yml

@@ -28,6 +28,7 @@ pkg.keywords:
 pkg.deps:
     - "@apache-mynewt-core/hw/hal"
     - "@apache-mynewt-core/hw/drivers/uart/uart_hal"
+    - "@apache-mynewt-core/mgmt/image_header"
 
 pkg.deps.ETH_0:
     - "@apache-mynewt-core/hw/drivers/lwip/pic32_eth"