Add Essemi MCU packs.

pyocd.yaml

@@ -23,3 +23,4 @@ pack:
   - ./packs/NXP.MIMXRT1052_A0_DFP.10.0.0-small.pack
   - ./packs/NXP.MIMXRT1052_DFP.12.1.0-small.pack
   - ./packs/Keil.AT32F4xx_DFP.1.3.2.pack
+  - ./packs/Eastsoft.ES32_DFP.1.0.9.pack