input: it7258_ts_i2c: add low reset and reset delay support

Add low reset gpio and delay reset support for ITE tech
driver.
ITE tech controller support low reset gpio configuration. This
property is parsed from the DT, and reset gpio is set to low.
Reset delay value is also parsed from DT which is required by the
ITE tech controller.

Change-Id: I314677747e8bbbcb273cd898376bbe03197c8c25
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>