clk: add lpc18xx creg clk driver
The CREG block on lpc18xx contains configuration register for two low power clocks. Support enabling of these two clocks with a clk driver that access CREG trough the syscon regmap interface. These clocks are needed to support peripherals like the internal RTC on lpc18xx. Signed-off-by:Joachim Eastwood <manabian@gmail.com> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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