input: msg21xx_ts: Mstar touch driver optimization

Mstar driver uses the ic-type DT property for dynamic detection
support. Driver reads a register from the controller and compares
both the values to check if connected touch controller is of
Mstar or not.
Remove all DBG messages and convert them to dev_dbg/info.
Add a debugfs entry for suspend/resume.
Remove ts_data/pdata global declaration and use dev_get_drvdata()
and input_set_drvdata()/dev_set_drvdata() instead.

Change-Id: Ia053745d48faf68b946fbb0cf16d392cbfdd2a3c
Signed-off-by: Mao Li <maol@codeaurora.org>