Add support for Mode SeventyFive (#16030)

* Initial M75H support

* Remove BSLS key

* Add M75S initial support

* Define DYNAMIC_KEYMAP_EEPROM_MAX_ADDR to allow VIA

* Add layer 1 for M75H

* Add layer 1 for M75H

* Fix layouts

* Add BOOTLOADER and remove BOOTLOADER address from rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/mode/m75s/rules.mk

@@ -0,0 +1,23 @@
+# MCU name
+MCU = STM32F401
+
+# Bootloader selection
+BOOTLOADER = stm32-dfu
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = yes      # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = no       # Mouse keys
+EXTRAKEY_ENABLE = yes      # Audio control and System control
+CONSOLE_ENABLE = no        # Console for debug
+COMMAND_ENABLE = no        # Commands for debug and configuration
+NKRO_ENABLE = no            # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no      # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+AUDIO_ENABLE = no           # Audio output
+EEPROM_DRIVER = i2c
+LTO_ENABLE = yes
+
+# Enter lower-power sleep mode when on the ChibiOS idle thread
+OPT_DEFS += -DCORTEX_ENABLE_WFI_IDLE=TRUE -DDEBUG_EEPROM_OUTPUT=TRUE