soc: arm: intel_socfpga_std: Rename with HWMv2

Rename SoC for better HWMv2 use:
 `intel_socfpga_std_cyclonev` --> `cyclonev`

The resulting shortened board name:
 `cyclonev_socdk/intel_socfpga_std_cyclonev` -->
 `cyclonev_socdk/cyclonev`

Signed-off-by: Dmitrii Golovanov <dmitrii.golovanov@intel.com>

boards/intel/intel_socfpga_std/cyclonev_socdk/board.yml

@@ -1,4 +1,4 @@
 board:
   name: cyclonev_socdk
   socs:
-    - name: intel_socfpga_std_cyclonev
+    - name: cyclonev

soc/intel/intel_socfpga_std/cyclonev/Kconfig.soc

@@ -17,4 +17,4 @@ config SOC_CYCLONEV
 	  Intel SoC FPGA Cyclone V
 
 config SOC
-	default "intel_socfpga_std_cyclonev" if SOC_CYCLONEV
+	default "cyclonev" if SOC_CYCLONEV

soc/intel/intel_socfpga_std/soc.yml

@@ -3,4 +3,4 @@ family:
     series:
       - name: cyclonev
         socs:
-          - name: intel_socfpga_std_cyclonev
+          - name: cyclonev