pinctrl: sirf: add lost USP-based UART pin groups for prima2
USP(Universal Serial Ports) can be UART as commit 5df83111, this patch defines the USP-based UART function pin groups for prima2. Signed-off-by: Qipan Li <Qipan.Li@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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