drivers/ddr/fsl: Adjust bstopre value

By default the bstopre value has been set to 0x100, used to be 1/4
value of refint. Modern DDR has increased the refresh time. Adjust
to 1/4 of refresh interval dynamically. Individual board can still
override this value in board ddr file, or to use auto-precharge.

Signed-off-by: York Sun <yorksun@freescale.com>
diff --git a/include/fsl_ddr.h b/include/fsl_ddr.h
index 728503b..1ac092b 100644
--- a/include/fsl_ddr.h
+++ b/include/fsl_ddr.h
@@ -103,7 +103,7 @@
 				const dimm_params_t *dimm_params,
 				common_timing_params_t *outpdimm,
 				unsigned int number_of_dimms);
-unsigned int populate_memctl_options(int all_dimms_registered,
+unsigned int populate_memctl_options(const common_timing_params_t *common_dimm,
 				memctl_options_t *popts,
 				dimm_params_t *pdimm,
 				unsigned int ctrl_num);