thermal: tsens: Update order of members in TSENS device structure

Last member of TSENS device structure should be pointer to
sensor array of variable size. Move the mtcsys member
above to avoid corrupting the array of sensor structs.

Change-Id: I41b814af4a28e9de2c09b92623b010b835e56c1d
Signed-off-by: Jishnu Prakash <jprakash@codeaurora.org>