nand: denali: enable ONFI detection for SoCFPGA SoC64

nand: denali: enable ONFI detection for SoCFPGA SoC64

Enable ONFI parameter page detection for SoCFPGA SoC64 devices by
selecting SYS_NAND_ONFI_DETECTION in the NAND_DENALI Kconfig entry.

This allows SoCFPGA SoC64 platforms using the Denali NAND controller
to automatically detect NAND parameters via the ONFI interface instead
of relying on hardcoded configuration values.

The selection is limited to TARGET_SOCFPGA_SOC64 to avoid affecting
non-SoC64 platforms that use legacy NAND handling.

Signed-off-by: Dinesh Maniyam <dinesh.maniyam@altera.com>
Reviewed-by: Tien Fong Chee <tien.fong.chee@altera.com>