github: workflows: Add SPI tests to MSPM33 build workflow

Add SPI loopback and DT Spec tests to the MSPM33 build automation
workflow to ensure proper SPI driver functionality.

Signed-off-by: Aman Lachhiramka <[email protected]>

Author: Aman-Lachhiramka-ti

.github/workflows/dev_mspm33_build.yml

@@ -109,3 +109,17 @@ jobs:
           cd ~/zephyrproject/zephyr
           source ~/zephyrproject/zephyr/zephyr-env.sh
           west build -p always -b lp_mspm33c321a samples/drivers/uart/echo_bot
+
+      - name: Build SPI Loopback Test
+        run: |
+          source ~/zephyrproject/.venv/bin/activate
+          cd ~/zephyrproject/zephyr
+          source ~/zephyrproject/zephyr/zephyr-env.sh
+          west build -p always -b lp_mspm33c321a tests/drivers/spi/spi_loopback
+
+      - name: Build SPI DT Spec Test
+        run: |
+          source ~/zephyrproject/.venv/bin/activate
+          cd ~/zephyrproject/zephyr
+          source ~/zephyrproject/zephyr/zephyr-env.sh
+          west build -p always -b lp_mspm33c321a tests/drivers/spi/dt_spec