fix grc import error for phy blocks

grc/cdc_phy_rx.block.yml

@@ -46,8 +46,8 @@ outputs:
     optional: true
 
 templates:
-    imports: 'from phy_rx import phy_rx  # grc-generated hier_block'
-    make: "phy_rx(\n    excess_bw=${ excess_bw },\n    sps=${ sps },\n)"
+    imports: from gnuradio import cdc
+    make: cdc.phy_rx(excess_bw=${excess_bw}, sps=${sps})
     callbacks:
     - set_excess_bw(${excess_bw})
     - set_sps(${sps})

grc/cdc_phy_tx.block.yml

@@ -39,9 +39,8 @@ outputs:
     optional: true
 
 templates:
-    imports: 'from phy_tx import phy_tx  # grc-generated hier_block'
-    make: "phy_tx(\n    excess_bw=${ excess_bw },\n    phasing=${ phasing },\n   \
-        \ sps=${ sps },\n)"
+    imports: from gnuradio import cdc 
+    make: cdc.phy_tx(excess_bw=${excess_bw}, phasing=${phasing}, sps=${sps})
     callbacks:
     - set_excess_bw(${excess_bw})
     - set_phasing(${phasing})