variant: Add menu entries for STM32G030CxT

This patch add two chips:
 - STM32G030C6T
 - STM32G030C8T

Signed-off-by: hitech95 <nicveronese@gmail.com>

Author: hitech95

README.md

@@ -293,6 +293,7 @@ User can add a STM32 based board following this [wiki](https://github.com/stm32d
 
 | Status | Device(s) | Name | Release | Notes |
 | :----: | :-------: | ---- | :-----: | :---- |
+| :yellow_heart: | STM32G030C6<br>STM32G030C8 | Generic Board | *2.2.0* |
 | :green_heart: | STM32G030K8 | [Aurora One](https://www.bfy.kr/aurora-one/) | *2.0.0* |
 | :green_heart: | STM32G030K6<br>STM32G030K8 | Generic Board | *2.0.0* |  |
 | :green_heart: | STM32G031J4<br>STM32G031J6 | Generic Board | *2.0.0* |  |

boards.txt

@@ -3190,6 +3190,22 @@ GenG0.menu.pnum.AURORA_ONE.build.product_line=STM32G030xx
 GenG0.menu.pnum.AURORA_ONE.build.variant=STM32G0xx/G030K(6-8)T
 GenG0.menu.pnum.AURORA_ONE.build.variant_h=variant_{build.board}.h
 
+# Generic G030C6Tx
+GenG0.menu.pnum.GENERIC_G030C6TX=Generic G030C6Tx
+GenG0.menu.pnum.GENERIC_G030C6TX.upload.maximum_size=32768
+GenG0.menu.pnum.GENERIC_G030C6TX.upload.maximum_data_size=8192
+GenG0.menu.pnum.GENERIC_G030C6TX.build.board=GENERIC_G030C6TX
+GenG0.menu.pnum.GENERIC_G030C6TX.build.product_line=STM32G030xx
+GenG0.menu.pnum.GENERIC_G030C6TX.build.variant=STM32G0xx/G030C(6-8)T
+
+# Generic G030C8Tx
+GenG0.menu.pnum.GENERIC_G030C8TX=Generic G030C8Tx
+GenG0.menu.pnum.GENERIC_G030C8TX.upload.maximum_size=65536
+GenG0.menu.pnum.GENERIC_G030C8TX.upload.maximum_data_size=8192
+GenG0.menu.pnum.GENERIC_G030C8TX.build.board=GENERIC_G030C8TX
+GenG0.menu.pnum.GENERIC_G030C8TX.build.product_line=STM32G030xx
+GenG0.menu.pnum.GENERIC_G030C8TX.build.variant=STM32G0xx/G030C(6-8)T
+
 # Generic G030K6Tx
 GenG0.menu.pnum.GENERIC_G030K6TX=Generic G030K6Tx
 GenG0.menu.pnum.GENERIC_G030K6TX.upload.maximum_size=32768