arty_a7_100t incorrect fileset dependency

[patrickerich]

In the corescore.core file the arty_a7_100t target has the following filesets:

filesets: [base, emitter_serv, arty_a7]

However, the rtl (rtl/corescore_arty_a7.v) instantiates the emitter_uart module, not the emitter_serv module.

Changing the rtl to use the emitter_serv with 306 cores resulted in (Vivado 2023.2):

ERROR: [DRC RTSTAT-6] Partial route conflicts: 10447 net(s) have a partial conflict.

Changing the corescore.core file to use the emitter_uart module resulted in a successful corescore of 306 cores.