st_smi: Enhance the error handling
This commit does the following: - Reports error if SNOR flash is not found on the board - Changes smi_read_sr to return error using which a retry mechanism is implemented for reading flash status Signed-off-by: NVipin Kumar <vipin.kumar@st.com> Signed-off-by: NAmit Virdi <amit.virdi@st.com> Signed-off-by: NStefan Roese <sr@denx.de>
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