serial: 8250_uniphier: hardcode regshift to avoid unneeded memory read
For this driver, uart_port::regshift is always 2. Hardcode the shift value instead of reading ->regshift to get an already known value. (pointed out by Denys Vlasenko) Furthermore, I am using register macros that are already shifted, which will save code a bit. Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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