[POWERPC] 8xx: Add clock-frequency to adder875 and mpc885ads dts
cpm_uart_core has a dependency on fsl,cpm-brg/clock-frequency, this means that a .dts that uses the cpm uart driver needs to supply a clock-frequency entry for get_brgfreq to return a meaningful number. Signed-off-by: NBryan O'Donoghue <bodonoghue@codehermit.ie> Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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