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Clock framework on SuperH architecture

The framework on SH extends existing API by the function clk_set_rate_ex,
which prototype is as follows:

    clk_set_rate_ex (struct clk *clk, unsigned long rate, int algo_id)

The algo_id parameter is used to specify algorithm used to recalculate clocks,
adjanced to clock, specified as first argument. It is assumed that algo_id==0
means no changes to adjanced clock

Internally, the clk_set_rate_ex forwards request to clk->ops->set_rate method,
if it is present in ops structure. The method should set the clock rate and adjust
all needed clocks according to the passed algo_id.
Exact values for algo_id are machine-dependend. For the sh7722, the following
values are defined:

        NO_CHANGE       = 0,
        IUS_N1_N1,      /* I:U = N:1, U:Sh = N:1 */
        IUS_322,        /* I:U:Sh = 3:2:2        */
        IUS_522,        /* I:U:Sh = 5:2:2        */
        IUS_N11,        /* I:U:Sh = N:1:1        */
        SB_N1,          /* Sh:B = N:1            */
        SB3_N1,         /* Sh:B3 = N:1           */
        SB3_32,         /* Sh:B3 = 3:2           */
        SB3_43,         /* Sh:B3 = 4:3           */
        SB3_54,         /* Sh:B3 = 5:4           */
        BP_N1,          /* B:P   = N:1           */
        IP_N1           /* I:P   = N:1           */

Each of these constants means relation between clocks that can be set via the FRQCR
register