xilinx: zynq: Add missing prototype for zynqmp_mmio_write

Add missing prototype to fix the sparse warning, warning: no
previous prototype for 'zynqmp_mmio_write' [-Wmissing-prototypes].

Signed-off-by: Algapally Santosh Sagar <santoshsagar.algapally@amd.com>
Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@amd.com>
Link: https://lore.kernel.org/r/20230614090359.10809-3-ashok.reddy.soma@amd.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
diff --git a/include/zynqmp_firmware.h b/include/zynqmp_firmware.h
index 1192d59..c56ad3f 100644
--- a/include/zynqmp_firmware.h
+++ b/include/zynqmp_firmware.h
@@ -454,6 +454,7 @@
 int zynqmp_pm_set_gem_config(u32 node, enum pm_gem_config_type config,
 			     u32 value);
 int zynqmp_pm_is_function_supported(const u32 api_id, const u32 id);
+int zynqmp_mmio_write(const u32 address, const u32 mask, const u32 value);
 
 /* Type of Config Object */
 #define PM_CONFIG_OBJECT_TYPE_BASE	0x1U