n80xx-common: change the include at the beginning, which prevents to override smdk4412-common product files with n80xx's, with inherit-product
If we have two files with the same name used with PRODUCT_COPY_FILES, it takes always the first one and not the ones in the tree

Change-Id: I27ead596ad14a9f16e2c18b532b2894f3f26218d