msm: qpnp-revid: Do not read STATUS1 register for PMD9655 subtype

Since the PMD9655 PMIC does not have the STATUS1 register,
update the probe function to check for pmic_subtype before
attempting to read this register value.

Change-Id: I76d6839eacd7a6ee5044f6f54f16cbaf34d55803
Signed-off-by: Devesh Jhunjhunwala <deveshj@codeaurora.org>