Instead of setting kernel/user space instruction and data ROM as
hard-coded values on linker, set them according to the max size
of the kernel image set by CONFIG_ESP32S3_KERNEL_IMAGE_SIZE. This
is done by making KIROM, UIROM, KDROM and UDROM dependent on the
kernel size value. Also, override CONFIG_NUTTX_USERSPACE config
according to CONFIG_ESP32S3_KERNEL_IMAGE_SIZE by using a custom
PREBUILD definition.
