corstone1000: enable isp1763 usb controller and mmc

MPS3 board have a ISP1763 usb controller, enable it to be used
for mass storage access for example. Enable the usb command
also and for the FVP support for mass storage enable the mmc
command.

Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
diff --git a/configs/corstone1000_defconfig b/configs/corstone1000_defconfig
index ba5cf03..b928fc3 100644
--- a/configs/corstone1000_defconfig
+++ b/configs/corstone1000_defconfig
@@ -28,6 +28,8 @@
 # CONFIG_CMD_XIMG is not set
 CONFIG_CMD_LOADM=y
 # CONFIG_CMD_LOADS is not set
+CONFIG_CMD_MMC=y
+CONFIG_CMD_USB=y
 # CONFIG_CMD_SETEXPR is not set
 # CONFIG_CMD_NFS is not set
 CONFIG_CMD_CACHE=y
@@ -50,4 +52,5 @@
 CONFIG_RTC_EMULATION=y
 CONFIG_DM_SERIAL=y
 CONFIG_USB=y
+CONFIG_USB_ISP1760=y
 CONFIG_ERRNO_STR=y