Add mechlovin9 rev2 PCB (#12767)

* Add mechlovin9 rev2 PCB

Move mechlovin9 PCB from mechlovin/hannah65/mechlovin9 to mechlovin/mechlovin9
And add mechlovin9 rev.2

* update

* change bootloader and  bootmagic button

* Add mechlovin9 rev2 PCB

Move mechlovin9 PCB from mechlovin/hannah65/mechlovin9 to mechlovin/mechlovin9
And add mechlovin9 rev.2

keyboards/mechlovin/mechlovin9/rev2/config.h

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+/*
+Copyright 2020 Team Mechlovin'
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#define PRODUCT_ID    0x6509
+#define DEVICE_VER    0x0002
+#define PRODUCT       Mechlovin9 Rev2
+
+/*
+ * Keyboard Matrix Assignments
+ *
+ * Change this to how you wired your keyboard
+ * COLS: AVR pins used for columns, left to right
+ * ROWS: AVR pins used for rows, top to bottom
+ * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode)
+ *                  ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
+ *
+ */
+#define MATRIX_ROW_PINS { A0, A1, A2, A3, A4 }
+#define MATRIX_COL_PINS { B2, B1, B0, B3, B4, B5, D0, D1, D5, D6, D7, C0, C3, C2, C1 }
+
+#define LED_CAPS_LOCK_PIN A7
+
+#define BACKLIGHT_PIN D4
+#define BACKLIGHT_BREATHING
+
+/* Bootmagic Lite key configuration */
+ #define BOOTMAGIC_LITE_ROW 0
+ #define BOOTMAGIC_LITE_COLUMN 13

keyboards/mechlovin/mechlovin9/rev2/readme.md

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+# mechlovin9
+
+![mechlovin9](https://i.imgur.com/T5Lm6OYl.png)
+
+A 65% PCB, compatible with Kyuu.
+
+* Keyboard Maintainer: [Team Mechlovin](https://github.com/mechlovin)
+* Hardware Supported: Kyuu Keyboard.
+* Hardware Availability: [Reddit GB](https://www.reddit.com/r/mechmarket/comments/i61par/gb_mechlovin_9_a_kyuu_65_keyboard_compatible_pcb/)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make mechlovin/mechlovin9/rev1:default
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+**Reset Key:** To put the mechlovin9 PCB into bootloader, hold ESC and plug cable.

keyboards/mechlovin/mechlovin9/rev2/rules.mk

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+# MCU name
+MCU = atmega32a
+
+# Processor frequency
+F_CPU = 16000000
+
+# Bootloader selection
+BOOTLOADER = bootloadHID
+