Add default to IConsumerIr interface's initrc

Fixes build for devices using this interface.

$ ./out/host/linux-x86/bin/host_init_verifier
      -p $OUT/obj/ETC/passwd_intermediates/passwd
      -k out/soong/.intermediates/known_hidl_interfaces.txt
    hardware/interfaces/ir/1.0/default/android.hardware.ir@1.0-service.rc

  >> host_init_verifier:
  >>>> hardware/interfaces/ir/1.0/default/android.hardware.ir@1.0-service.rc:
  >>>> 2: interface requires 2 arguments

  >> host_init_verifier: Failed to parse init script

  >> 'hardware/interfaces/ir/1.0/default/android.hardware.ir@1.0-service.rc'
  >>>> with 1 errors

Test: make dist # fails before change, passes after
Change-Id: Ia23b855424905c465fa4ee13f8910aa47d194899