ACPI: OSL: Add empty lines after local variable declarations

Fix up four places where there is no empty line after declarations of
local variables in a function (as per the kernel coding style).

Signed-off-by: Jonathan Bergh <bergh.jonathan@gmail.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>