Renaming the SKP_ prefix to silk_

silk/fixed/silk_LTP_analysis_filter_FIX.c

silk/fixed/silk_LTP_scale_ctrl_FIX.c

silk/fixed/silk_corrMatrix_FIX.c

silk/fixed/silk_encode_frame_FIX.c

silk/fixed/silk_find_LPC_FIX.c

silk/fixed/silk_find_LTP_FIX.c

silk/fixed/silk_find_pitch_lags_FIX.c

silk/fixed/silk_find_pred_coefs_FIX.c

silk/fixed/silk_noise_shape_analysis_FIX.c

silk/fixed/silk_prefilter_FIX.c

silk/fixed/silk_process_gains_FIX.c

silk/fixed/silk_regularize_correlations_FIX.c

silk/fixed/silk_residual_energy16_FIX.c

silk/fixed/silk_residual_energy_FIX.c

silk/fixed/silk_solve_LS_FIX.c

silk/fixed/silk_structs_FIX.h

silk/fixed/silk_warped_autocorrelation_FIX.c

silk/float/silk_LPC_analysis_filter_FLP.c

silk/float/silk_LPC_inv_pred_gain_FLP.c

silk/float/silk_LTP_analysis_filter_FLP.c