serial: pl01x: Change OF_CONTROL to OF_REAL

Before this change, building this driver for SPL with enabled SPL_DM_SERIAL
was problematic, as '-Wunused-const-variable=' warning was visible.

Now, the code is only considered when u-boot proper is build.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
1 file changed