Added rogallina board support

...m32f4/stm32f429zi_skyward_rogallina/core/stage_1_boot.cpp

...i_skyward_rogallina/interfaces-impl/arch_registers_impl.h

...2f4/stm32f429zi_skyward_rogallina/interfaces-impl/bsp.cpp

.../stm32f429zi_skyward_rogallina/interfaces-impl/bsp_impl.h

...texM4_stm32f4/stm32f429zi_skyward_rogallina/rogallina.cfg

...tm32f4/stm32f429zi_skyward_rogallina/stm32_2m+256k_rom.ld

...stm32f4/stm32f429zi_skyward_rogallina/stm32_2m+6m_xram.ld

...stm32f4/stm32f429zi_skyward_rogallina/stm32_2m+8m_xram.ld

miosix/config/Makefile.inc

...M4_stm32f4/stm32f429zi_skyward_rogallina/board_settings.h