gpio-util: Remove Makefile.am

The Makefile.am file is no longer used in meson.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I12734a42f938cbe7561d0d2dcc0343422113777b
diff --git a/gpio-util/Makefile.am b/gpio-util/Makefile.am
deleted file mode 100644
index d596362..0000000
--- a/gpio-util/Makefile.am
+++ /dev/null
@@ -1,16 +0,0 @@
-AM_DEFAULT_SOURCE_EXT = .cpp
-AM_CPPFLAGS = -iquote ${top_srcdir}
-
-bin_PROGRAMS = \
-	phosphor-gpio-util
-
-phosphor_gpio_util_SOURCES = \
-	argument.cpp \
-	gpio.cpp \
-	main.cpp
-
-phosphor_gpio_util_LDADD = \
-	$(PHOSPHOR_LOGGING_LIBS)
-
-phosphor_gpio_util_CXXFLAGS = \
-	$(PHOSPHOR_LOGGING_CFLAGS)