[dice] Refactor get_input_values_vector / make_input_values

Refactoring get_input_values_vector / make_input_values by
creating const for sample data, to make the code more readable.

This is part of the project of merging the two existing dice
wrapper libraries into one library. The upstream library
libdiced_open_dice will be the merged library.

Test: atest diced_sample_inputs_test
Bug: 267575445
Change-Id: I5585428470f039ce644fcaaf371fdcd1fe75f718
1 file changed