firmware-utils: move bcm_tag.h here

Since there is only one user of bcm_tag.h left, we can safely move it
into the firmware-utils directory, replacing the symlink.

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33655 3c298f89-4303-0410-b956-a3cf2f4a3e73

[brcm63xx] move bcm_tag.h out of the flashmap patch so that user-land tools can re-use it

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20548 3c298f89-4303-0410-b956-a3cf2f4a3e73

[tools] firmware-utils: copy bcm_tag.h to src/ and get rid of cc3 macro, fixes imagetag compilation


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19485 3c298f89-4303-0410-b956-a3cf2f4a3e73