build: sidk_s5jt200: do not put binary header manually

build: sidk_s5jt200: do not put binary header manually

This commit simplifies the build script. Instead of putting the
placeholder for NS2 header into the raw binary, we can do the same thing
with the linker scripts more easily.

This removes a Kconfig entry, CONFIG_DISABLE_MAKING_BINARY_HEADER also.
It is replaced by CONFIG_SAMSUNG_NS2.

Change-Id: I86d057e85f8bfce415c492decb670a7bb6c36df0
Signed-off-by: Heesub Shin <heesub.shin@samsung.com>