Add support for some important configuration options and FSP memory init.
The memory init uses swizzle tables from the device tree.

Support for the FSP_S binary is also included.

Bootstage timing is used for both FSP_M and FSP_S and memory-mapped SPI
reads.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>