regulator: tps6594-regulator: Remove a useless static qualifier

There is no point in having 'npname' a static variable. So remove the
static qualifier. This is cleaner and saves a few bytes.

On a x86_64, with allmodconfig:
Before:
======
text data bss dec hex filename
27949 12176 64 40189 9cfd drivers/regulator/tps6594-regulator.o

After:
=====
text data bss dec hex filename
27947 12112 0 40059 9c7b drivers/regulator/tps6594-regulator.o

Signed-off-by: Christophe JAILLET <[e-mail]>
Link: https://patch.msgid.link/ebc53d4049[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/regulator/tps6594-regulator.c

···
 	bool buck_configured[BUCK_NB] = { false };
 	bool buck_multi[MULTI_PHASE_NB] = { false };
 
-	static const char *npname;
+	const char *npname;
 	int error, i, irq, multi;
 	int irq_idx = 0;
 	int buck_idx = 0;