kvx: gas: missing aliases for $r14r15 in assembler.

Most registers from a register-pair suffixed by .lo and .hi suffixes.
This was not the case of $r14 and $r15 since they are defined by the
ABI: $r14 is the frame pointer, and $r15 is used to return aggregates
from functions.  We do not add aliases for $r12 (the stack pointer) and
$r13 (the tls register).

opcodes/ChangeLog:

	* kvx-opc.c: Regenerate.

gas/ChangeLog:

	* config/kvx-parse.h: Regenerate.