warp7: secure_defconfig: Remove secure_defconfig

This patch removes warp7_secure_defconfig. A previous patch set
CONFIG_ARMV7_BOOT_SEC_DEFAULT=y on the unsecure WaRP7 config. Fabio asked
if I could confirm that the NXP and upstream kernels will boot on the WaRP7
with CONFIG_ARMV7_BOOT_SEC_DEFAULT=y. I can confirm that this is the case,
so there's no need to support the secure defconfig - drop it now.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Suggested-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>

board/warp7/MAINTAINERS

@@ -4,4 +4,3 @@ S:	Maintained
 F:	board/warp7/
 F:	include/configs/warp7.h
 F:	configs/warp7_defconfig
-F:	configs/warp7_secure_defconfig

configs/warp7_secure_defconfig

@@ -1,43 +0,0 @@
-CONFIG_ARM=y
-CONFIG_ARCH_MX7=y
-CONFIG_SYS_TEXT_BASE=0x87800000
-CONFIG_TARGET_WARP7=y
-CONFIG_ARMV7_BOOT_SEC_DEFAULT=y
-# CONFIG_ARMV7_VIRT is not set
-CONFIG_IMX_RDC=y
-CONFIG_IMX_BOOTAUX=y
-# CONFIG_CMD_BMODE is not set
-CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/warp7/imximage.cfg"
-CONFIG_HUSH_PARSER=y
-# CONFIG_CMD_BOOTD is not set
-CONFIG_CMD_BOOTZ=y
-# CONFIG_CMD_IMI is not set
-# CONFIG_CMD_XIMG is not set
-CONFIG_CMD_MEMTEST=y
-CONFIG_CMD_DFU=y
-CONFIG_CMD_GPIO=y
-CONFIG_CMD_MMC=y
-CONFIG_CMD_PART=y
-CONFIG_CMD_USB=y
-CONFIG_CMD_USB_MASS_STORAGE=y
-# CONFIG_CMD_SETEXPR is not set
-CONFIG_CMD_CACHE=y
-CONFIG_CMD_EXT2=y
-CONFIG_CMD_EXT4=y
-CONFIG_CMD_EXT4_WRITE=y
-CONFIG_CMD_FAT=y
-CONFIG_DFU_MMC=y
-CONFIG_FSL_ESDHC=y
-CONFIG_USB=y
-CONFIG_USB_EHCI_HCD=y
-CONFIG_MXC_USB_OTG_HACTIVE=y
-CONFIG_USB_GADGET=y
-CONFIG_USB_GADGET_MANUFACTURER="FSL"
-CONFIG_USB_GADGET_VENDOR_NUM=0x0525
-CONFIG_USB_GADGET_PRODUCT_NUM=0xa4a5
-CONFIG_CI_UDC=y
-CONFIG_USB_GADGET_DOWNLOAD=y
-CONFIG_USB_ETHER=y
-CONFIG_USB_ETH_CDC=y
-CONFIG_USBNET_HOST_ADDR="de:ad:be:af:00:00"
-CONFIG_OF_LIBFDT=y