msm_serial: msm_uart_next_id decrease when probe failed

When the msm_serial driver defer probed, if
msm_uart_next_id increased at the beginning
of probe, should decreased when probe failed.

Change-Id: I8a2594afca17c4ab5fef78da822ffdf39377d0bb
Signed-off-by: Yue Liu <quic_yueliu@quicinc.com>