Add missing `gf180mcu_fd_bd_sram` to .gitmodules
Fixes #13.
```
git submodule update --init --recursive
fatal: No url found for submodule path 'libraries/gf180mcu_fd_bd_sram/latest' in .gitmodules
```
Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>
diff --git a/.gitmodules b/.gitmodules
index f92d502..3f12985 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -19,6 +19,13 @@
branch = main
shallow = true
+# gf180mcu_fd_bd_sram
+[submodule "libraries/gf180mcu_fd_bd_sram/latest"]
+ path = libraries/gf180mcu_fd_bd_sram/latest
+ url = https://github.com/google/globalfoundries-pdk-libs-gf180mcu_fd_bd_sram.git
+ branch = main
+ shallow = true
+
# gf180mcu_fd_io
[submodule "libraries/gf180mcu_fd_io/latest"]
path = libraries/gf180mcu_fd_io/latest
