base: Add addIntlvBits to AddrRange

base: Add addIntlvBits to AddrRange

This method performs the opposite operation of removeIntlvBits and can
be used to transform a channel-local address to a global PA.

Change-Id: I2fab587d7c094597e52422305775ac7f31efba34
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/21599
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Tested-by: kokoro <noreply+kokoro@google.com>