arm64: dts: toshiba: tmpv7708: Align node names with DT bindings

arm64: dts: toshiba: tmpv7708: Align node names with DT bindings

DT bindings expect node names to follow certain pattern, dtbs_check
warnings:

  tmpv7708-rm-mbrc.dtb: pmux@24190000 (toshiba,tmpv7708-pinctrl):
    'pwm_mux' does not match any of the regexes: '-pins$', '^pinctrl-[0-9]+$'
  tmpv7708-rm-mbrc.dtb pmux@24190000 (toshiba,tmpv7708-pinctrl):
    $nodename:0: 'pmux@24190000' does not match '^(pinctrl|pinmux)(@[0-9a-f]+)?$'
  tmpv7708-rm-mbrc.dtb: wdt@28330000 (toshiba,visconti-wdt):
    $nodename:0: 'wdt@28330000' does not match '^(timer|watchdog)(@.*|-([0-9]|[1-9][0-9]+))?$'

Reviewed-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.x90@mail.toshiba>
Link: https://patch.msgid.link/20251022133616.74492-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>