Staging: dt3155: remove remaining 32-bit and 8-bit global registers

Remove the remaining global 32-bit and 8-bit i2c registers. Create a
local variable of the correct type where they are needed.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Scott Smedley <ss@aao.gov.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>