driver/ddr/fsl: Add support for multiple DDR clocks

Controller number is passed for function calls to support individual
DDR clock, depending on SoC implementation. It is backward compatible
with exising platforms. Multiple clocks have been verifyed on LS2085A
emulator.

Signed-off-by: York Sun <yorksun@freescale.com>

include/fsl_ddr_dimm_params.h

@@ -112,7 +112,7 @@ typedef struct dimm_params_s {
 #endif
 } dimm_params_t;
 
-extern unsigned int ddr_compute_dimm_parameters(
+unsigned int ddr_compute_dimm_parameters(const unsigned int ctrl_num,
 					 const generic_spd_eeprom_t *spd,
 					 dimm_params_t *pdimm,
 					 unsigned int dimm_number);