configs: am335x_evm: Enable FASTBOOT based on kconfig

When CONFIG_CMD_FASTBOOT or CONFIG_USB_FUNCTION_FASTBOOT are defined
in am335x_evm.h, a dependency on g_dnl.c is created. This in turn
creates a dependency on having USB gadget enabled.
As a result we can't create configs with USB gadget disabled.

Since these CONFIG_ variables are now part of kconfig, move them to
the board defconfigs, and out of am335x_evm.h. This both preserves
current defaults, and allows creating configs with USB gadget off.

Signed-off-by: Alexandru Gagniuc <alex.g@adaptrum.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/am335x_evm_spiboot_defconfig b/configs/am335x_evm_spiboot_defconfig
index 40c165d..562c048 100644
--- a/configs/am335x_evm_spiboot_defconfig
+++ b/configs/am335x_evm_spiboot_defconfig
@@ -15,6 +15,10 @@
 CONFIG_SPL=y
 CONFIG_SPL_STACK_R=y
 CONFIG_SPL_MUSB_NEW_SUPPORT=y
+CONFIG_FASTBOOT=y
+CONFIG_USB_FUNCTION_FASTBOOT=y
+CONFIG_FASTBOOT_BUF_ADDR=0x81000000
+CONFIG_FASTBOOT_BUF_SIZE=0x07000000
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
 # CONFIG_CMD_SETEXPR is not set