Renamed core driver dependency to be "dash" style aligned

Signed-off-by: alexander <alexander.efremov@arm.com>
Change-Id: I86b1d658ddd9aa717eb571286a9e5f5e053725cf
diff --git a/.gitmodules b/.gitmodules
index 06532f6..12a4df7 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -5,7 +5,7 @@
 	path = dependencies/cmsis
 	url = https://github.com/ARM-software/CMSIS_5.git
 [submodule "dependencies/core_driver"]
-	path = dependencies/core_driver
+	path = dependencies/core-driver
 	url = https://review.mlplatform.org/ml/ethos-u/ethos-u-core-driver
 [submodule "dependencies/core-software"]
 	path = dependencies/core-software