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The dependency on this macro was added by patch [1]. But the macro
itself was forgotten in the patch.

 [1] 128e0b3e

 ("stm32mp1: update rules for stm32image tool")

Change-Id: I49219e1e13828b97b95f404983da33ef4567fe23
Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>