ARM: SAMSUNG: Delete unused plat/regs-serial.h header file
ARM: SAMSUNG: Delete unused plat/regs-serial.h header file

There are no more users of this file, it can be deleted now.

Signed-off-by: Tushar Behera <23164e61763db67ca52e6268847d2536aec6eaa9@linaro.org>
Signed-off-by: Kukjin Kim <3fc711f4e08bc570a586748633ff7c76d0e1e253@samsung.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs