power: smblib: extend wait time after force sink in try.SNK

In Try.SNK software implementation, after forcing sink, there
is a delay of tDRPTRY + Tccdebounce time, giviing opportunity
to the other side to be a SRC.

The current delay is 100ms < tDRPTRY (90ms) + Tccdebounce (20ms),
too short, which sometimes results in checking Tccdebounce_done
status too early.

Change the delay to 120ms.

Change-Id: If9fe9aa7c405a5ae6416e9373449c4a76295e4d8
Signed-off-by: Harry Yang <harryy@codeaurora.org>