misc: atmel_pwm: fix Kconfig symbols

AT91 symbols AT91SAM9263, AT91SAM9RL, and AT91SAM9G45 do not exist and this
patch changes them to their correct ARCH_* version.
These symbols are chosen instead of the SOC_* ones because this driver is not
converted to DT.
Anyway, the ATMEL_PWM symbol and the associated driver will be removed soon,
during the move to the PWM sub-system.
Reported-by: NPaul Bolle <pebolle@tiscali.nl>
Acked-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

drivers/misc/Kconfig

@@ -54,7 +54,7 @@ config AD525X_DPOT_SPI
 config ATMEL_PWM
 	tristate "Atmel AT32/AT91 PWM support"
 	depends on HAVE_CLK
-	depends on AVR32 || AT91SAM9263 || AT91SAM9RL || AT91SAM9G45
+	depends on AVR32 || ARCH_AT91SAM9263 || ARCH_AT91SAM9RL || ARCH_AT91SAM9G45
 	help
 	  This option enables device driver support for the PWM channels
 	  on certain Atmel processors.  Pulse Width Modulation is used for