driver: edac: create an interface to check ecc feature status

commit 618173d5

 from
git://git.yoctoproject.org/linux-yocto v5.10/standard/intel-sdk-5.10/intel-socfpga.

Create an interface, SMC instruction is used to check ecc status by
reading ecc ctrl1 register in EL3 level.

Signed-off-by: Meng Li <Meng.Li@windriver.com>
Signed-off-by: Liwei Song <liwei.song@windriver.com>