ARM: Add support for 64 bit register reads/writes  Add macros to read and write to 64 bit registers.  Change-Id: Id45d4086aa148ba96df3987c3341c133f1c56541 Signed-off-by: Olav Haugan <ohaugan@codeaurora.org> Signed-off-by: Iliyan Malchev <malchev@google.com>  Conflicts: 	arch/arm/include/asm/io.h