clk: ultrarisc: Add DP1000 clock driver

Add a clock driver for the UltraRISC DP1000 SoC.

The clock tree is driven by a SYSPLL and provides fixed-factor clocks for
the subsystem and PCIe, divider-ba

clk: ultrarisc: Add DP1000 clock driver

Add a clock driver for the UltraRISC DP1000 SoC.

The clock tree is driven by a SYSPLL and provides fixed-factor clocks for
the subsystem and PCIe, divider-based root clocks for GMAC and the UART,
I2C, and SPI blocks, and per-instance gate clocks for UART0-3, I2C0-3,
and SPI0-1.

Signed-off-by: Jia Wang <wangjia@ultrarisc.com>
Reviewed-by: Brian Masney <bmasney@redhat.com>
Signed-off-by: Brian Masney <bmasney@redhat.com>

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