Add initial support for M65S (#14027)

* Add initial support for M65S

* Remove LTO_ENABLE from rules.mk

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Removed defs in rules.mk, remove EEPROM debug code in m65s.c

Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/mode/m65s/rules.mk

@@ -0,0 +1,23 @@
+# MCU name
+MCU = STM32F401
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = lite     # Virtual DIP switch configuration
+MOUSEKEY_ENABLE = no       # Mouse keys
+EXTRAKEY_ENABLE = no       # Audio control and System control
+CONSOLE_ENABLE = yes       # Console for debug
+COMMAND_ENABLE = no        # Commands for debug and configuration
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = no           # USB Nkey Rollover
+BACKLIGHT_ENABLE = no      # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+BLUETOOTH_ENABLE = no       # Enable Bluetooth
+AUDIO_ENABLE = no           # Audio output
+EEPROM_DRIVER = i2c
+# Enter lower-power sleep mode when on the ChibiOS idle thread
+OPT_DEFS += -DCORTEX_ENABLE_WFI_IDLE=TRUE -DDEBUG_EEPROM_OUTPUT=TRUE
+STM32_BOOTLOADER_ADDRESS = 0x1FFF0000