input: sensors: fix i2c errors caused by LTR553

LTR553 driver may initial i2c transfer even the sensor chip is not
powered up. This may cause i2c issues. Fix this issue by not call
i2c APIs when fake interrupt happened.

Change-Id: Iff678232548cbaec9e974f751be9085a789267e6
Signed-off-by: Oliver Wang <mengmeng@codeaurora.org>