Fix meson build

Since the previous patch did not enable LOOKUP_GPIO_BASE and
incorrectly defined the object path, etc., the buttons process
failed to start, this commit fixes these problems

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I0285795370d751db2d0fe738cae5645df3d7c955
diff --git a/meson_options.txt b/meson_options.txt
index f6d3445..683a4f5 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -11,3 +11,10 @@
     value: 3000,
     description : 'Time to long press the button'
 )
+
+option(
+    'lookup-gpio-base',
+    type : 'feature',
+    value: 'enabled',
+    description : 'Look up the GPIO base value in /sys/class/gpio. Otherwise use a base of 0.'
+)