rcar_gen3: drivers: pfc: M3W: Drop forward declarations

There's no point in having forward declaration just before the function
itself, drop it. No functional change.
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Change-Id: I936232205adbfc834fffdfa015ec5c5d4e3480ea

drivers/staging/renesas/rcar/pfc/M3/pfc_init_m3.c

@@ -612,9 +612,6 @@
 #define RDMCHCRB_SLM_256	(0x00000080U)	/* once in 256 clock cycle */
 #define RDMDPBASE_SEL_EXT	(0x00000001U)	/* External memory use */
 
-static void StartRtDma0_Descriptor(void);
-static void pfc_reg_write(uint32_t addr, uint32_t data);
-
 static void StartRtDma0_Descriptor(void)
 {
 	uint32_t reg;