This commit fixes a bug on the `usbconsole` defconfigs for
Espressif's RISC-V SoCs when the serial/JTAG is used and the
Kconfig macro `DEBUG_FEATURES` is enabled. This config enables the
`showprogress` macro during start-up. Previously, `riscv_lowputc`
function was used by this macro, but it is not suitable for the
serial/JTAG console. Instead, use the `esp_rom_printf` function
that is suitable for both serial/JTAG and UART consoles.
Signed-off-by: Tiago Medicci Serrano <tiago.medicci@espressif.com>