arch/sparc: Add a separate kernel memcpy functions for M8

arch/sparc: Add a separate kernel memcpy functions for M8

Add a dedicated kernel memory copy functions for M8 architecture.
Use M7memcpy functions from M7 architecture and update affected functions
to take advantage of new Load Misaligned load/store instructions.

Following functions are going to be affected.
memcpy, copy_from_user and copy_to_user.

Following functions will not change. Will remain same as M7.
clear_page, clear_user_page, memset and bzero.

Orabug: 25381567

Signed-off-by: Babu Moger <babu.moger@oracle.com>
Signed-off-by: Allen Pais <allen.pais@oracle.com>