platform/x86: thinkpad_acpi: Fix 'warning: no previous prototype for' warnings

Some of the new dytc handling functions are not marked static, even though
they are only used internally.

Mark these static, fixing the following compiler warnings:

drivers/platform/x86/thinkpad_acpi.c:10081:5: warning: no previous prototype for 'dytc_profile_get' [-Wmissing-prototypes]
drivers/platform/x86/thinkpad_acpi.c:10095:5: warning: no previous prototype for 'dytc_cql_command' [-Wmissing-prototypes]
drivers/platform/x86/thinkpad_acpi.c:10133:5: warning: no previous prototype for 'dytc_profile_set' [-Wmissing-prototypes]

Cc: Mark Pearson <markpearson@lenovo.com>
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20210204140158.268289-1-hdegoede@redhat.com

drivers/platform/x86/thinkpad_acpi.c

@@ -10078,7 +10078,7 @@ static int convert_profile_to_dytc(enum platform_profile_option profile, int *pe
  * dytc_profile_get: Function to register with platform_profile
  * handler. Returns current platform profile.
  */
-int dytc_profile_get(struct platform_profile_handler *pprof,
+static int dytc_profile_get(struct platform_profile_handler *pprof,
 			    enum platform_profile_option *profile)
 {
 	*profile = dytc_current_profile;
@@ -10092,7 +10092,7 @@ int dytc_profile_get(struct platform_profile_handler *pprof,
  *  - enable CQL
  *  If not in CQL mode, just run the command
  */
-int dytc_cql_command(int command, int *output)
+static int dytc_cql_command(int command, int *output)
 {
 	int err, cmd_err, dummy;
 	int cur_funcmode;
@@ -10130,7 +10130,7 @@ int dytc_cql_command(int command, int *output)
  * dytc_profile_set: Function to register with platform_profile
  * handler. Sets current platform profile.
  */
-int dytc_profile_set(struct platform_profile_handler *pprof,
+static int dytc_profile_set(struct platform_profile_handler *pprof,
 			    enum platform_profile_option profile)
 {
 	int output;