Includes recovery resources into vendor_boot-debug.img

Commit I56dda56bab7def1540f4fb506323e3e605620cd4 adds
BOARD_MOVE_RECOVERY_RESOURCES_TO_VENDOR_BOOT and includes
$(TARGET_RECOVERY_ROOT_OUT) directory when building vendor
ramdisk if BOARD_MOVE_RECOVERY_RESOURCES_TO_VENDOR_BOOT is set.

We should do the same thing when building the vendor debug
ramdisk as well. Otherwise, lacking some recovery files
makes the device unable to boot into fastbootd/recovery mode.

Bug: 177712689
Test: `make vendorbootimage_debug`, then unpack
      ./obj/PACKAGING/vendor-boot-debug_intermediates/vendor-ramdisk-debug.cpio.lz4
      to check it includes recovery resources via:
      `lz4 -d -c ../vendor-ramdisk-debug.cpio.lz4 | cpio -idm`
Test: device can boot into fastbootd after flashing vendor_boot-debug.img

Change-Id: I4744c6600866436ed7d5a321e67e20b8f3da8a81