use mock config for stmhal, setup hid in boot

src/boot.py

@@ -0,0 +1,6 @@
+import sys
+
+if sys.platform in ['trezor', 'pyboard']: # stmhal
+    import pyb
+    # hid=(subclass, protocol, max_packet_len, polling_interval, report_desc)
+    pyb.usb_mode('CDC+HID', vid=0x1209, pid=0x53C1, hid=(0, 0, 64, 1, b'\x06\x00\xff\x09\x01\xa1\x01\x09\x20\x15\x00\x26\xff\x00\x75\x08\x95\x40\x81\x02\x09\x21\x15\x00\x26\xff\x00\x75\x08\x95\x40\x91\x02\xc0'))

src/trezor/config.py

@@ -1,23 +1,13 @@
 import sys
-
-if sys.platform == 'trezor': # stmhal - use binary module (not working atm)
-
-    from TrezorConfig import Config
-
-    _config = Config()
-
-    def get(app, key, default=None):
-        v = _config.get(app, key)
-        return v if v else default
-
-    def set(app, key, value):
-        return _config.set(app, key, value)
-
-else: # emulator (mock implementation using binary file)
-
 import ustruct
 
+# mock implementation using binary file
+
 _mock = {}
+
+if sys.platform in ['trezor', 'pyboard']: # stmhal
+    _file = '/flash/trezor.config'
+else:
     _file = '/var/tmp/trezor.config'
 
 def _load():

src/trezor/config.py.real

@@ -0,0 +1,10 @@
+from TrezorConfig import Config
+
+_config = Config()
+
+def get(app, key, default=None):
+    v = _config.get(app, key)
+    return v if v else default
+
+def set(app, key, value):
+    return _config.set(app, key, value)