main/pcsc-lite: restore usb reader support
USB readers (e.g. YubiKey?) appear to have stopped working after upgrading to pcsc-lite 2.2.0. I believe the pre-Meson build options enabled USB reader support by default whereas the upgrade (e3bd4dd5) explicitly disables the usb
option.
In the previous configure options libusb support is explicitly disabled, which is also the current default (uses libudev instead), so there is no change in behavior there.