EQ tune: Update m4 format EQ filter coefficients syntax

This patch updates the export format to currently used format in
topology. It adds also possibility to pass text comment into line
above the bytes from EQ design script. The date is appended
automatically after comment.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

Author: singalsu

tune/eq/eq_tplg_write.m

@@ -1,4 +1,4 @@
-function eq_tplg_write(fn, blob8, eqtype)
+function eq_tplg_write(fn, blob8, eqtype, comment)
 
 %%
 % Copyright (c) 2018, Intel Corporation
@@ -30,6 +30,10 @@ function eq_tplg_write(fn, blob8, eqtype)
 % Author: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
 %
 
+if nargin < 4
+	comment = 'Exported EQ';
+end
+
 %% Pad blob length to multiple of four bytes
 n_orig = length(blob8);
 n_new = ceil(n_orig/4)*4;
@@ -39,8 +43,8 @@ function eq_tplg_write(fn, blob8, eqtype)
 %% Write blob
 fh = fopen(fn, 'w');
 nl = 8;
-fprintf(fh, '`SectionData."''N_EQ_%s($1)`_data_bytes" {''\n', ...
-       upper(eqtype));
+fprintf(fh, '# %s %s\n', comment, date());
+fprintf(fh, 'CONTROLBYTES_PRIV(EQ%s_priv,\n', upper(eqtype));
 fprintf(fh, '`       bytes "');
 for i = 1:nl:n_new
 	if i > 1
@@ -57,7 +61,7 @@ function eq_tplg_write(fn, blob8, eqtype)
 	end
 	fprintf(fh, '''\n');
 end
-fprintf(fh, '`}''\n');
+fprintf(fh, ')\n');
 fclose(fh);
 
 end