[GS] Added Gemini GS BSP and HWMapping

...texM7_stm32f7/stm32f767zi_gemini_gs/core/stage_1_boot.cpp

...m32f767zi_gemini_gs/interfaces-impl/arch_registers_impl.h

...xM7_stm32f7/stm32f767zi_gemini_gs/interfaces-impl/bsp.cpp

..._stm32f7/stm32f767zi_gemini_gs/interfaces-impl/bsp_impl.h

...stm32f7/stm32f767zi_gemini_gs/interfaces-impl/hwmapping.h

...rtexM7_stm32f7/stm32f767zi_gemini_gs/stm32_2m+16m_xram.ld

...rtexM7_stm32f7/stm32f767zi_gemini_gs/stm32_2m+384k_ram.ld

...h/cortexM7_stm32f7/stm32f767zi_gemini_gs/board_settings.h

miosix/config/boards.cmake

miosix/config/options.cmake