scripts: nrfjprog: Use built-in pin reset enable

Use nrfjprog's built-in pin reset enabling functionality instead of
doing it manually.

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
diff --git a/scripts/support/runner/nrfjprog.py b/scripts/support/runner/nrfjprog.py
index abd5804..13aa655 100644
--- a/scripts/support/runner/nrfjprog.py
+++ b/scripts/support/runner/nrfjprog.py
@@ -76,16 +76,11 @@
         ]
         if self.family == 'NRF52':
             commands.extend([
-                # Set reset pin
-                ['nrfjprog', '--memwr', '0x10001200', '--val', '0x00000015',
-                 '-f', self.family, '--snr', board_snr],
-                ['nrfjprog', '--memwr', '0x10001204', '--val', '0x00000015',
-                 '-f', self.family, '--snr', board_snr],
-                ['nrfjprog', '--reset', '-f', self.family, '--snr', board_snr],
+                # Enable pin reset
+                ['nrfjprog', '--pinresetenable', '-f', self.family,
+                 '--snr', board_snr],
             ])
-        commands.append(['nrfjprog',
-                         '--pinreset',
-                         '-f', self.family,
+        commands.append(['nrfjprog', '--pinreset', '-f', self.family,
                          '--snr', board_snr])
 
         for cmd in commands: