corstone1000: enable NVM XIP QSPI flash

add the QSPI flash device with block storage capability

Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
diff --git a/configs/corstone1000_defconfig b/configs/corstone1000_defconfig
index 383317f..35f7635 100644
--- a/configs/corstone1000_defconfig
+++ b/configs/corstone1000_defconfig
@@ -52,3 +52,4 @@
 CONFIG_USB=y
 CONFIG_USB_ISP1760=y
 CONFIG_ERRNO_STR=y
+CONFIG_NVMXIP_QSPI=y