msm: socinfo: Support multiplatform

Upstream prefers existing drivers be converted to support multiplatform
kernels.  This requires drivers to be located in directories that
contain generic functionality instead of specific mach directories.
Move the socinfo driver into drivers/soc/qcom and update the initcall
levels to satisfy dependencies.

Change-Id: If195cd793d84867d371f25136a88f2a7ce239500
Signed-off-by: Xiaocheng Li <lix@codeaurora.org>
Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>