msm_serial_hs: Remove redundant pdata check during probe

pdata is checked for errors when msm_hs_dt_to_pdata is called.

Change-Id: I3b73aef2c07b2cd0de7c7edf43f2643b96781a4c
Signed-off-by: Naveen Kaje <nkaje@codeaurora.org>