uboot-phytec

st_smi: Read status until timeout happens

SMI driver read status fails because the control register could not be
overwritten. Instead, the read status should be tried until timeout.

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Amit Virdi <amit.virdi@st.com>
Signed-off-by: Stefan Roese <sr@denx.de>