dt-bindings: thermal: amlogic: Fix missing header in the example

Usage of defines from headers requires including relevant header,
otherwise dt_binding_check fails:

  Lexical error: Documentation/devicetree/bindings/thermal/amlogic,thermal.example.dts:59.27-34 Unexpected 'GIC_SPI'
  Lexical error: Documentation/devicetree/bindings/thermal/amlogic,thermal.example.dts:59.38-57 Unexpected 'IRQ_TYPE_LEVEL_HIGH'
  Lexical error: Documentation/devicetree/bindings/thermal/amlogic,thermal.example.dts:60.37-45 Unexpected 'CLKID_TS'

Fixes: b1c8ccdbd4e9 ("dt-bindings: thermal: amlogic: Add support for T7")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260622100231.438435-3-krzysztof.kozlowski@oss.qualcomm.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

[ upstream commit: 41f1be36957c29c35a1e0703673cf1ae8f4db195 ]