ARM: tty: Move HVC DCC assembly to arch/arm

Put architecture-specific assembly code where it belongs,
allowing for support of additional architectures such as arm64 in
the future.

Signed-off-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc arch/arm/include/asm/dcc.h
Simple merge

diff --cc drivers/tty/hvc/hvc_dcc.c
Simple merge