Add I2C and GPIO drivers

drivers/gpio/LICENSE.txt

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+Copyright 2023 CoolStar
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

drivers/gpio/README.md

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+Rockchip 3xxx GPIO Driver
+
+Tested on RK3588S
+
+Implements Windows GpioClx so most existing GPIO drivers should attach and work
+
+Tested operations:
+* Connect (I/O)
+* Read
+* Write
+* Edge Interrupts
+* Level Interrupts