zephyr: Increase CONFIG_CONSOLE_GETCHAR_BUFSIZE to 258.

It needs to be at least this big for `tools/pyboard.py` to work, which is
used (among other things) by `tests/run-tests.py`.
Signed-off-by: Damien George <damien@micropython.org>

ports/zephyr/prj.conf

@@ -8,7 +8,7 @@ CONFIG_UART_CONSOLE_DEBUG_SERVER_HOOKS=y
 
 CONFIG_CONSOLE_SUBSYS=y
 CONFIG_CONSOLE_GETCHAR=y
-CONFIG_CONSOLE_GETCHAR_BUFSIZE=128
+CONFIG_CONSOLE_GETCHAR_BUFSIZE=258
 CONFIG_CONSOLE_PUTCHAR_BUFSIZE=128
 
 CONFIG_NEWLIB_LIBC=y

ports/zephyr/prj_minimal.conf

@@ -6,7 +6,7 @@ CONFIG_POLL=y
 CONFIG_UART_INTERRUPT_DRIVEN=y
 CONFIG_CONSOLE_SUBSYS=y
 CONFIG_CONSOLE_GETCHAR=y
-CONFIG_CONSOLE_GETCHAR_BUFSIZE=32
+CONFIG_CONSOLE_GETCHAR_BUFSIZE=258
 CONFIG_CONSOLE_PUTCHAR_BUFSIZE=32
 # TODO: Disable once https://github.com/zephyrproject-rtos/zephyr/pull/13731 is merged
 #CONFIG_CONSOLE=n