am335x_evm: Add NOR to Kconfig

Make enabling support for NOR (and describe where it's seen) be done via
Kconfig.

Signed-off-by: Tom Rini <trini@ti.com>

board/ti/am335x/Kconfig

@@ -22,4 +22,11 @@ config CONS_INDEX
 	  board you may want something other than UART0 as for example the IDK
 	  uses UART3 so enter 4 here.
 
+config NOR
+	bool "Support for NOR flash"
+	help
+	  The AM335x SoC supports having a NOR flash connected to the GPMC.
+	  In practice this is seen as a NOR flash module connected to the
+	  "memory cape" for the BeagleBone family.
+
 endif

configs/am335x_evm_nor_defconfig

@@ -1,5 +1,6 @@
 CONFIG_SPL=y
-CONFIG_SYS_EXTRA_OPTIONS="NAND,NOR"
+CONFIG_SYS_EXTRA_OPTIONS="NAND"
 CONFIG_CONS_INDEX=1
 +S:CONFIG_ARM=y
 +S:CONFIG_TARGET_AM335X_EVM=y
+CONFIG_NOR=y

configs/am335x_evm_norboot_defconfig

@@ -1,4 +1,5 @@
-CONFIG_SYS_EXTRA_OPTIONS="NOR,NOR_BOOT"
+CONFIG_SYS_EXTRA_OPTIONS="NOR_BOOT"
 CONFIG_CONS_INDEX=1
 CONFIG_ARM=y
 CONFIG_TARGET_AM335X_EVM=y
+CONFIG_NOR=y