avr32: Retire AVR32 for good

AVR32 is gone. It's already more than two years for no support in Buildroot,
even longer there is no support in GCC (last version is heavily patched 4.2.4).

Linux kernel v4.12 got rid of it (and v4.11 didn't build successfully).

There is no good point to keep this support in U-Boot either.

Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index bef864f..fe01c73 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -37,8 +37,8 @@
 	depends on ARCH_AT91
 	help
 	  This enables driver for the Atmel SPI Controller, present on
-	  many AT32 (AVR32) and AT91 (ARM) chips. This driver can be
-	  used to access the SPI Flash, such as AT25DF321.
+	  many AT91 (ARM) chips. This driver can be used to access
+	  the SPI Flash, such as AT25DF321.
 
 config CADENCE_QSPI
 	bool "Cadence QSPI driver"