console: Add semihosting console

Many chips have only one serial port. When the serial port is occupied
by other devices, there is a lack of a console to output debugging
information. Semihosting can provide a console. The disadvantage of
semihosting is that a debugger must be connected, so it can only be
used for online debugging.

Signed-off-by: ZhongYao Luo <LuoZhongYao@gmail.com>
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
diff --git a/CODEOWNERS b/CODEOWNERS
index 0da97fc..456cbf3 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -139,6 +139,7 @@
 /drivers/can/*mcp2515*                    @karstenkoenig
 /drivers/clock_control/*nrf*              @nordic-krch
 /drivers/counter/                         @nordic-krch
+/drivers/console/semihost_console.c       @luozhongyao
 /drivers/counter/counter_cmos.c           @andrewboie
 /drivers/counter/maxim_ds3231.c           @pabigot
 /drivers/crypto/*nrf_ecb*                 @maciekfabia @anangl