only use $(TEXT_BASE) if it is set

we've moved
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let's try this again ...

we've moved TEXT_BASE out of the build system for Blackfin and into the config header so that when porting to a new board, users dont need to set both the CFG_MONITOR_BASE and TEXT_BASE to the same value in two remotely different files

for u-boot general though, i'd like to apply the attached patch that simply says only utilize TEXT_BASE in global common files if it is set ... that way everyone else can continue to use TEXT_BASE in their board specific .mk files while in Blackfin, we can simply unset it
-mike
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