Raise an error when partition setting is wrong

When setting target out path at root(/product, /system_ext), either file
system type or prebuilt image must be set. If not, we'd rather raise an
error.

Without raising an error, the artifacts in these directory are not
included in any image.

And also, extract these logics into function, and check product, odm, system_ext
For now, exempt vendor image because of some targets with prebuilt
vendor image.
Bug: 137169253
Test: set TARGET_COPY_OUT_PRODUCT := product
          BOARD_PRODUCTIMAGE_FILE_SYSTEM_TYPE :=
	  BOARD_PREBUILT_PRODUCTIMAGE :=
      and then check if it causes an error.
Test: set TARGET_COPY_OUT_PRODUCT := system/product
          BOARD_PRODUCTIMAGE_FILE_SYSTEM_TYPE := ext4 or
	  BOARD_PREBUILT_PRODUCTIMAGE := someimage.img
      and then check if it causes an error.

Change-Id: Ibf0f7838111075ba3649e198e5649aa7e8e29d7c