regulator: fix typo in Kconfig and max8973-regulator

MAX8973 is supposed to be MAX8973A. Kconfig and the
initial comment of max8973-regulator.c were modified
accordingly.
Signed-off-by: NRamona Alexandra Nechita <ramona.nechita@analog.com>
Link: https://lore.kernel.org/r/20210920061137.10884-1-ramona.nechita@analog.comSigned-off-by: NMark Brown <broonie@kernel.org>

drivers/regulator/Kconfig

@@ -609,12 +609,12 @@ config REGULATOR_MAX8952
 	  modes ranging from 0.77V to 1.40V by 0.01V steps.
 
 config REGULATOR_MAX8973
-	tristate "Maxim MAX8973 voltage regulator "
+	tristate "Maxim MAX8973A voltage regulator"
 	depends on I2C
 	depends on THERMAL && THERMAL_OF
 	select REGMAP_I2C
 	help
-	  The MAXIM MAX8973 high-efficiency. three phase, DC-DC step-down
+	  The MAXIM MAX8973A high-efficiency. three phase, DC-DC step-down
 	  switching regulator delivers up to 9A of output current. Each
 	  phase operates at a 2MHz fixed frequency with a 120 deg shift
 	  from the adjacent phase, allowing the use of small magnetic component.

drivers/regulator/max8973-regulator.c

 /*
- * max8973-regulator.c -- Maxim max8973
+ * max8973-regulator.c -- Maxim max8973A
  *
- * Regulator driver for MAXIM 8973 DC-DC step-down switching regulator.
+ * Regulator driver for MAXIM 8973A DC-DC step-down switching regulator.
  *
  * Copyright (c) 2012, NVIDIA Corporation.
  *