spi: spi-zynq-qspi: Remove multiple instances of clock enable

The driver was enabling pclk, refclk and the qspi controller at multiple
instances. The clocks and the controller should be enabled only once so
update the driver to enable the clocks & the controller only once.

Addresses-coverity: Unchecked return value (CHECKED_RETURN)

Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>

drivers/spi/spi-zynq-qspi.c

@@ -234,8 +234,6 @@ static void zynq_qspi_init_hw(struct zynq_qspi *xqspi, unsigned int num_cs)
 			(1 << ZYNQ_QSPI_LCFG_DUMMY_SHIFT) |
 			ZYNQ_QSPI_FAST_READ_QOUT_CODE));
 #endif
-	zynq_qspi_write(xqspi, ZYNQ_QSPI_ENABLE_OFFSET,
-			ZYNQ_QSPI_ENABLE_ENABLE_MASK);
 }
 
 static bool zynq_qspi_supports_op(struct spi_mem *mem,
@@ -405,8 +403,6 @@ static int zynq_qspi_setup_op(struct spi_device *spi)
 	if (ctlr->busy)
 		return -EBUSY;
 
-	clk_enable(qspi->refclk);
-	clk_enable(qspi->pclk);
 	zynq_qspi_write(qspi, ZYNQ_QSPI_ENABLE_OFFSET,
 			ZYNQ_QSPI_ENABLE_ENABLE_MASK);