ARM: zynq: Add missing i2c get_rate for fixing i2c SPL

The commit 'f48ef0d8' did break I2C
support because requesting the clock for the I2C ip-block isn't
supported during SPL.

To fixup this we add support requesting clocks for:
- i2c0
- i2c1
Signed-off-by: NHannes Schmelzer <hannes.schmelzer@br-automation.com>
Reviewed-by: NHeiko Schocher <hs@denx.de>
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

drivers/clk/clk_zynq.c

@@ -434,6 +434,8 @@ static ulong zynq_clk_get_rate(struct clk *clk)
 	case lqspi_clk ... pcap_clk:
 	case sdio0_clk ... spi1_clk:
 		return zynq_clk_get_peripheral_rate(priv, id, 0);
+	case i2c0_aper_clk ... i2c1_aper_clk:
+		return zynq_clk_get_cpu_rate(priv, cpu_1x_clk);
 	default:
 		return -ENXIO;
 	}