arm/dt: msm8974: Enable PNOC BUS workaround only for V1

PNOC (Peripheral NOC) present on some MSM targets has
a hardware BUG which degrades the USB peripheral performance.
Fix for this is enabling software workaround that changes the
USB mem-type attribute value (from 0 to 2) via VMIDMT.
This hardware issue is present only on V1, hence, disable the
workaround on all other msm8974 versions.

Change-Id: I81d6758bf8c54b1fd3b1b799960aa43e7f42d9ab
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>