msm: thermal: Add uio extension in KTM for memory mapping

Since /dev/mem node no longer available for userspace
IO memory access, add UIO support in KTM for userspace
app to access IO memory mapped region. A UIO device
will be in the format /dev/uioX. Userspace uses mmap()
on these devices to access registers/memory.

Change-Id: I7a1a258cdf76a327b77e0995c8dad2ea0be63577
Signed-off-by: Shiju Mathew <shijum@codeaurora.org>