Convert CONFIG_CMD_PCMCIA to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_PCMCIA

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 8fab42d..ef614a6 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -741,6 +741,14 @@
 	  peripherals. Sub-commands allow bus enumeration, displaying and
 	  changing configuration space and a few other features.
 
+config CMD_PCMCIA
+	bool "pinit - Set up PCMCIA device"
+	help
+	  Provides a means to initialise a PCMCIA (Personal Computer Memory
+	  Card International Association) device. This is an old standard from
+	  about 1990. These devices are typically removable memory or network
+	  cards using a standard 68-pin connector.
+
 config CMD_REMOTEPROC
 	bool "remoteproc"
 	depends on REMOTEPROC