ALSA: pcxhr: More constifications

Apply const prefix to each possible place: the board parameters and
DSP command table, and the string arrays.

Just for minor optimization and no functional changes.

Link: https://lore.kernel.org/r/20200105144823.29547-24-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/pcxhr/pcxhr.c

@@ -136,7 +136,7 @@ struct board_parameters {
 	short fw_file_set;
 	short firmware_num;
 };
-static struct board_parameters pcxhr_board_params[] = {
+static const struct board_parameters pcxhr_board_params[] = {
 [PCI_ID_VX882HR] =      { "VX882HR",      4, 4, 0, 41 },
 [PCI_ID_PCX882HR] =     { "PCX882HR",     4, 4, 0, 41 },
 [PCI_ID_VX881HR] =      { "VX881HR",      4, 4, 0, 41 },

sound/pci/pcxhr/pcxhr_core.c

@@ -466,7 +466,7 @@ enum {
 /*
  * Array of DSP commands
  */
-static struct pcxhr_cmd_info pcxhr_dsp_cmds[] = {
+static const struct pcxhr_cmd_info pcxhr_dsp_cmds[] = {
 [CMD_VERSION] =				{ 0x010000, 1, RMH_SSIZE_FIXED },
 [CMD_SUPPORTED] =			{ 0x020000, 4, RMH_SSIZE_FIXED },
 [CMD_TEST_IT] =				{ 0x040000, 1, RMH_SSIZE_FIXED },
@@ -497,7 +497,7 @@ static struct pcxhr_cmd_info pcxhr_dsp_cmds[] = {
 };
 
 #ifdef CONFIG_SND_DEBUG_VERBOSE
-static char* cmd_names[] = {
+static const char * const cmd_names[] = {
 [CMD_VERSION] =				"CMD_VERSION",
 [CMD_SUPPORTED] =			"CMD_SUPPORTED",
 [CMD_TEST_IT] =				"CMD_TEST_IT",
@@ -1006,7 +1006,7 @@ static int pcxhr_handle_async_err(struct pcxhr_mgr *mgr, u32 err,
 				  enum pcxhr_async_err_src err_src, int pipe,
 				  int is_capture)
 {
-	static char* err_src_name[] = {
+	static const char * const err_src_name[] = {
 		[PCXHR_ERR_PIPE]	= "Pipe",
 		[PCXHR_ERR_STREAM]	= "Stream",
 		[PCXHR_ERR_AUDIO]	= "Audio"

sound/pci/pcxhr/pcxhr_hwdep.c

@@ -348,7 +348,7 @@ static int pcxhr_dsp_load(struct pcxhr_mgr *mgr, int index,
  */
 int pcxhr_setup_firmware(struct pcxhr_mgr *mgr)
 {
-	static char *fw_files[][5] = {
+	static const char * const fw_files[][5] = {
 	[0] = { "xlxint.dat", "xlxc882hr.dat",
 		"dspe882.e56", "dspb882hr.b56", "dspd882.d56" },
 	[1] = { "xlxint.dat", "xlxc882e.dat",