Remove misleading comment in sample dumpstate impl

HIDL_FETCH_IDumpstateDevice isn't defined simply
because this is a binderized service and this function
would be called (to no great use) if it was installed
to a device.

Bug: N/A
Test: N/A
Change-Id: I9b660af3fe329977cdcd0c3f485af651c34416cb
1 file changed