This adjusts memory.ld to unblock CI issue: `nuttx_user.elf
section '.text' will not fit in region 'uflash'`
Signed-off-by: Yanfeng Liu <yfliu2008@qq.com>
Largely copy-and-paste from stm32f4discovery.
Also arch/arm/src/armv7-m/mpu.h: Ensure RBAR alignment
Fix crashes on init task startup I observed on qemu-system-arm -M lm3s6965evb.