thermal: renesas: Fix RZ/G3E fall-out

 - Restore sort order in MAINTAINERS and Kconfig,
 - Remove empty trailing line from Makefile.

Fixes: 19d3a401 ("thermal/drivers/renesas/rzg3e: Add thermal driver for the Renesas RZ/G3E SoC")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>