[U-Boot] Revert "serial: ns16550: fix debug uart putc called before init"

[Tom Rini]

On Mon, Dec 03, 2018 at 09:55:33PM +0100, Simon Goldschmidt wrote:

> This reverts commit 6f57c34473d37b8da5e6a3764d0d377d748aeef1 since it
> does not seem to work at least on rk3399.
> 
> The Rockchip Technical Reference Manual (TRM) for the rk3399 says the baud
> rate prescaler register is readable only when USR[0] is zero. Since this
> bit is defined as "reserved" in the socfpga cylcone5 TRM, let's rather
> drop this than making the ns16550 debug uart more platform specific.
> 
> Reported-by: Roosen Henri <Henri.Roosen at ginzinger.com>
> Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>
> Reviewed-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>

Applied to u-boot/master, thanks!

-- 
Tom
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