fiptool: Suppress verbose messages during normal build
fiptool: Suppress verbose messages during normal build

The output is shown only when built with V=1.

Change-Id: I17fef10df6f127f07956a78b478ff3cadba4bd61

lsigithub/arm-trusted-firmware_public,lsigithub/arm-trusted-firmware_public,sbranden/arm-trusted-firmware,achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware,sbranden/arm-trusted-firmware