misc: Increase dynamic number space

We've exhausted all of the 64 dynamic minor numbers in misc
devices. Ideally, we shouldn't be using so many misc devices. We
should be using cdev directly instead. Increase the number for
now so that kernel drivers don't fail to probe.

Change-Id: I514f4acc7d27b68005ec7f0a8d4ab3c0906b36ff
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>