msm_fb: display: Report correct fps to user space

There are only 30 pan updates per second due to MDDI
Type 1 interface bandwidth limitation. Hence, 30 fps
needs to reported to user space for MDDI Type 1 Panels
though the panel refreshes at 60Hz. Make change to all
type 1 panels to report only 30 fps to userspace.

CRs-fixed: 330584
Change-Id: I07784060ef7a3f37ac13cdecf8138afb6c27ee51
Signed-off-by: Jeevan Shriram <jshriram@codeaurora.org>