Rename pipe kernel service commands

Renames pipe kernel service commands so they no longer refer to channels.
	CHENQ_REQ    -> PIPE_PUT_REQUEST
	CHENQ_TMO    -> PIPE_PUT_TIMEOUT
	CHENQ_RPL    -> PIPE_PUT_REPLY
	CHENQ_ACK    -> PIPE_PUT_ACK
	CHDEQ_REQ    -> PIPE_GET_REQUEST
	CHDEQ_TMO    -> PIPE_GET_TIMEOUT
	CHDEQ_RPL    -> PIPE_GET_REPLY
	CHDEQ_ACK    -> PIPE_GET_ACK
	CH_MOVED_ACK -> PIPE_MOVEDATA_ACK

Change-Id: I28946a46199d4eaac331c552092060f04525dd3f
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>