Hexagon: add target builtins to kernel

commit f1f99adf

 upstream.

Add the compiler-rt builtins like memcpy to the hexagon kernel.

Signed-off-by: Sid Manning <sidneym@codeaurora.org>
Add SYM_FUNC_START/END, ksyms exports
Signed-off-by: Brian Cain <bcain@codeaurora.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>