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This patch fixes the build time condition deciding whether the
read-write data should be relocated from ROM to RAM. It was incorrectly
using __DATA_ROM_START__, which is a linker symbol and not a compiler
build flag. As a result, the relocation code was always compiled out.

This bug has been introduced by the following patch:
"Rationalize reset handling code"

Change-Id: I1c8d49de32f791551ab4ac832bd45101d6934045