Move application_check_valid() in bootentry.c to armcm_boot.c and make
the check specific to the ARM cortex-m. On these ARM machines it is
easier to validate the application stack address.
Also rename jump_to_application() to application_jump().
Also rename flash_read_block() to application_read_flash() and move to
armcm_boot.c .
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Move command handlers from canboot_main.c to flashcmd.c. Move startup
code to sched.c. Rename remaining bootloader entry code to new
bootentry.c file.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
