spi: spi-fsl-qspi: Reduce devm_ioremap size to 4 times AHB buffer size

Reduce devm_ioremap size to (4 * AHB_BUFER_SIZE) rather than mapping
complete QSPI-Memmory as driver is now independent of flash size.
Flash of any size can be accessed.

Issue was reported on platform where devm_ioremap failure is observed
with size > 256M.
Error log on LS1021ATWR :
 fsl-quadspi 1550000.spi: ioremap failed for resource [mem 0x40000000-0x7fffffff]
 fsl-quadspi 1550000.spi: Freescale QuadSPI probe failed
 fsl-quadspi: probe of 1550000.spi failed with error -12

This change was also suggested previously:
https://patchwork.kernel.org/patch/10508753/#22166385

Suggested-by: Boris Brezillon <[email protected]>
Signed-off-by: Kuldeep Singh <[email protected]>
Signed-off-by: Ashish Kumar <[email protected]>
Reviewed-by: Boris Brezillon <[email protected]>
Reviewed-by: Frieder Schrempf <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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