Migrate grc blocks from xml to yaml

Convert the blocks using cmdline_converter.py script from
https://gist.githubusercontent.com/haakov/4228ff6a14486641add538483093e86b/raw/c861a840e31182ace2e74f5425e356cb4f8b183a/cmdline_converter.py

Change-Id: Iee5c611a2e100bd2fdf487611a867dc937d8c292
diff --git a/grc/receiver/gsm_cx_channel_hopper.block.yml b/grc/receiver/gsm_cx_channel_hopper.block.yml
new file mode 100644
index 0000000..edee1fb
--- /dev/null
+++ b/grc/receiver/gsm_cx_channel_hopper.block.yml
@@ -0,0 +1,30 @@
+# auto-generated by grc.converter
+
+id: gsm_cx_channel_hopper
+label: CX Channel Hopper
+
+parameters:
+-   id: ma
+    label: MA
+    dtype: int_vector
+    default: '[]'
+-   id: maio
+    label: MAIO
+    dtype: int
+-   id: hsn
+    label: HSN
+    dtype: int
+
+inputs:
+-   domain: message
+    id: CX
+
+outputs:
+-   domain: message
+    id: bursts
+
+templates:
+    imports: import grgsm
+    make: grgsm.cx_channel_hopper(${ma}, ${maio}, ${hsn})
+
+file_format: 1