RISC-V: Add hartid and \n to interrupt logging

RISC-V: Add hartid and \n to interrupt logging

Add carriage return that was erroneously removed
when converting to qemu_log. Change hard coded
core number to the actual hartid.

Cc: Sagar Karandikar <[email protected]>
Cc: Bastian Koppelmann <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Alistair Francis <[email protected]>
Signed-off-by: Michael Clark <[email protected]>
Reviewed-by: Alistair Francis <[email protected]>
Signed-off-by: Alistair Francis <[email protected]>
Signed-off-by: Palmer Dabbelt <[email protected]>