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A new seek handler is also created. It will be used for NAND to add an
extra offset in case of bad blocks, when FIP is used.

Change-Id: I03fb1588b44029db50583c0b2e7af7a1e88a5a7a
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>