thermal: Adds missing interface for vendor.thermal-hal-2-0.

init_rc files require the entire interface inheritance hierarchy to
be listed, since e.g. all 1.0::IThermal functions are also implemented
by 2.0::IThermal.

Bug: 118016875
Test: builds & passes existing tests.
Merged-In: I3fe1bc5e103fc3dd631f5dabc3408803dbdcbd60
Change-Id: I3fe1bc5e103fc3dd631f5dabc3408803dbdcbd60

hidl/thermal/android.hardware.thermal@2.0-service.samsung.rc

@@ -1,4 +1,5 @@
 service vendor.thermal-hal-2-0 /vendor/bin/hw/android.hardware.thermal@2.0-service.samsung
+    interface android.hardware.thermal@1.0::IThermal default
     interface android.hardware.thermal@2.0::IThermal default
     class hal
     user system