shim_lock: Enable module for all EFI architectures
    
    Like the tpm the shim_lock module is only enabled for x86_64 target.
    However, there's nothing specific to x86_64 in the implementation and
    it can be enabled for all EFI architectures.
    
    Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
    Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>