Convert CONFIG_CMD_HD44760 to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_HD44760

Also drop CONFIG_CMD_HD44780 which appears to be a typo.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/work-microwave/work_92105/Kconfig b/board/work-microwave/work_92105/Kconfig
index 74f004f..1fde4b2 100644
--- a/board/work-microwave/work_92105/Kconfig
+++ b/board/work-microwave/work_92105/Kconfig
@@ -12,4 +12,9 @@
 config SYS_CONFIG_NAME
 	default "work_92105"
 
+config CMD_HD44760
+	bool "Enable 'hd44780' LCD-control comand"
+	help
+	  This controls the LCD driver.
+
 endif
diff --git a/board/work-microwave/work_92105/work_92105_display.c b/board/work-microwave/work_92105/work_92105_display.c
index 3d7438e..37a7363 100644
--- a/board/work-microwave/work_92105/work_92105_display.c
+++ b/board/work-microwave/work_92105/work_92105_display.c
@@ -346,4 +346,4 @@
 	"HD44780 LCD driver control",
 	hd44780_help_text
 );
-#endif /* CONFIG_CMD_HD44780 */
+#endif /* CONFIG_CMD_HD44760 */