ARM: at91: remove non-generic boards

Remove board support for afeb9260, tny_a9260, and sbc35_a9g20.

They have not been converted into Generic Board yet.
See doc/README.generic-board for details.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Sergey Lapin <slapin@ossfans.org>
Cc: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Cc: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/arch/arm/mach-at91/arm926ejs/at91sam9260_devices.c b/arch/arm/mach-at91/arm926ejs/at91sam9260_devices.c
index efb53d6..5e0c0f5 100644
--- a/arch/arm/mach-at91/arm926ejs/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/arm926ejs/at91sam9260_devices.c
@@ -166,7 +166,7 @@
 	at91_set_b_periph(AT91_PIO_PORTA, 25, 0);	/* ERX2 */
 	at91_set_b_periph(AT91_PIO_PORTA, 26, 0);	/* ERX3 */
 	at91_set_b_periph(AT91_PIO_PORTA, 27, 0);	/* ERXCK */
-#if defined(CONFIG_AT91SAM9260EK) || defined(CONFIG_AFEB9260)
+#if defined(CONFIG_AT91SAM9260EK)
 	/*
 	 * use PA10, PA11 for ETX2, ETX3.
 	 * PA23 and PA24 are for TWI EEPROM