drivers: mrvl_swup: Add logging for read flash call

commit 42b2ee7664e3344b31f26dfd2f72aefd982379ae from
git@git.assembla.com:cavium/WindRiver.linux.git

Introduce log feature for ATF SMC traces and maintain
compatibility with definition of old and new structures.

Change-Id: Ic9991f77958d8c3870d22d59079c66f5aff88cde
Signed-off-by: Sebastien Dubois <sebastien.dubois@nokia.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/106714
Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>