drivers: uart: esp32: use DEVICE_DT_INST_DEFINE()

Current uart driver implementation is incompleted regarding the
usage of DT_INST_FOREACH_STATUS_OKAY. If uart0 and uart2 are selected,
build breaks due to peripheral number ordering, which would be
0 and 1 in this case. This fix PR fix this by re-working the macros
and setting proper uart peripheral instances in DTSI, required for signal
routing configuration.

Signed-off-by: Sylvio Alves <sylvio.alves@espressif.com>
6 files changed