msm: kgsl: Fix overlap checking of address range

While checking if an address range can be merged or is contained within
a different address range also check if the type of the ranges are same.
If they are not same then do not merge them. Also, when checking for
overlap condition reduce the size of range by 1 since the last byte
till the size of the range is not a part of the range.

Change-Id: I721e5ee218d9222575516a188b6fc1e8649ecc10
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>