mx35: Remove declaration of non-existing function

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Stefano Babic <sbabic@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>

arch/arm/include/asm/arch-mx35/clock.h

@@ -62,8 +62,6 @@ enum mxc_peri_clock {
 	SPI2_CLK,
 };
 
-unsigned int imx_decode_pll(unsigned int pll, unsigned int f_ref);
-
 u32 imx_get_uartclk(void);
 u32 imx_get_fecclk(void);
 unsigned int mxc_get_clock(enum mxc_clock clk);