MLECO-3449: Update dependancies to 22.08 tags

Update dependencies to be aligned with 22.08 release of mlplatform
according to:
https://review.mlplatform.org/plugins/gitiles/ml/ethos-u/ethos-u/+/refs/heads/master/22.08.json
CMSIS-DSP is moved to a separate repository, this patch adds a new
repository along with user build parameter.

Signed-off-by: Maksims Svecovs <maksims.svecovs@arm.com>
Change-Id: I356fb19b5dac87a21adfc34c67f9699131666074
diff --git a/.gitmodules b/.gitmodules
index 2fc7c1a..fb89583 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -10,3 +10,6 @@
 [submodule "dependencies/core-platform"]
 	path = dependencies/core-platform
 	url = https://review.mlplatform.org/ml/ethos-u/ethos-u-core-platform
+[submodule "dependencies/cmsis-dsp"]
+	path = dependencies/cmsis-dsp
+	url = https://github.com/ARM-software/CMSIS-DSP.git