cpu: make ExecSymbol show the symbol in addition to address

cpu: make ExecSymbol show the symbol in addition to address

Before this commit, ExecSymbol would show only the symbol and no address:

0: system.cpu: A0 T0 : @_kernel_flags_le_lo32+6    :   mrs   x0, currentel

After this commit, it shows the symbol in addition to the address:

0: system.cpu: A0 T0 : 0x10 @_kernel_flags_le_lo32+6    :   mrs   x0, currentel

Change-Id: I665802f50ce9aeac6bb9e174b5dd06196e757c60
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/35077
Reviewed-by: Richard Cooper <richard.cooper@arm.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>