pwm: Make Kconfig entries more consistent

PWM is now consistently spelled in all uppercase letters. For the Atmel
driver the entry now also mentions Atmel to make it easier to find.
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>

drivers/pwm/Kconfig

@@ -38,7 +38,7 @@ config PWM_AB8500
 	  will be called pwm-ab8500.
 
 config PWM_ATMEL_TCB
-	tristate "TC Block PWM"
+	tristate "Atmel TC Block PWM support"
 	depends on ATMEL_TCLIB && OF
 	help
 	  Generic PWM framework driver for Atmel Timer Counter Block.
@@ -59,7 +59,7 @@ config PWM_BFIN
 	  will be called pwm-bfin.
 
 config PWM_IMX
-	tristate "i.MX pwm support"
+	tristate "i.MX PWM support"
 	depends on ARCH_MXC
 	help
 	  Generic PWM framework driver for i.MX.
@@ -116,7 +116,7 @@ config PWM_PXA
 	  will be called pwm-pxa.
 
 config PWM_SAMSUNG
-	tristate "Samsung pwm support"
+	tristate "Samsung PWM support"
 	depends on PLAT_SAMSUNG
 	help
 	  Generic PWM framework driver for Samsung.
@@ -195,7 +195,7 @@ config PWM_TWL_LED
 	  will be called pwm-twl-led.
 
 config PWM_VT8500
-	tristate "vt8500 pwm support"
+	tristate "vt8500 PWM support"
 	depends on ARCH_VT8500
 	help
 	  Generic PWM framework driver for vt8500.