cmd: pinmux: support pin name in status command

Allow pin name parameter for pimux staus command,
as gpio command to get status of one pin.

The possible usage of the command is:

> pinmux dev pinctrl
> pinmux status

> pinmux status -a

> pinmux status <pin-name>

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/test/cmd/Makefile b/test/cmd/Makefile
index 2cfe43a..a59adb1 100644
--- a/test/cmd/Makefile
+++ b/test/cmd/Makefile
@@ -8,5 +8,6 @@
 obj-y += mem.o
 obj-$(CONFIG_CMD_ADDRMAP) += addrmap.o
 obj-$(CONFIG_CMD_MEM_SEARCH) += mem_search.o
+obj-$(CONFIG_CMD_PINMUX) += pinmux.o
 obj-$(CONFIG_CMD_PWM) += pwm.o
 obj-$(CONFIG_CMD_SETEXPR) += setexpr.o