lib: utils/gpio: Generate FDT gpio driver list at compile-time

Instead of having FDT gpio driver list hard-coded in the C source,
we generate it using carray.sh at compile-time.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>

lib/utils/gpio/objects.mk

@@ -8,5 +8,9 @@
 #
 
 libsbiutils-objs-y += gpio/fdt_gpio.o
+libsbiutils-objs-y += gpio/fdt_gpio_drivers.o
+
+carray-fdt_gpio_drivers-y += fdt_gpio_sifive
 libsbiutils-objs-y += gpio/fdt_gpio_sifive.o
+
 libsbiutils-objs-y += gpio/gpio.o