mfd: twl: Use decimal numbers for TWL6030_MODULE_IDs

It is easier fro humans to understand decimal numbers than hexadecimals when
they are used as indexes.

Acked-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>