Add Cypress hardware crypto acceleration dependencies as submodules

Signed-off-by: Roman Okhrimenko <roman.okhrimenko@cypress.com>
diff --git a/.gitmodules b/.gitmodules
index d9439a5..4ef347f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -13,3 +13,6 @@
 [submodule "boot/cypress/libs/psoc6hal"]
 	path = boot/cypress/libs/psoc6hal
 	url = https://github.com/cypresssemiconductorco/psoc6hal.git
+[submodule "boot/cypress/libs/cy-mbedtls-acceleration"]
+	path = boot/cypress/libs/cy-mbedtls-acceleration
+	url = https://github.com/cypresssemiconductorco/cy-mbedtls-acceleration.git