spi: airoha-snfi: enable for EcoNet EN7528

Enable the Airoha SNFI (SPI NAND Flash Interface) driver for EcoNet
EN7528 SoC. The EN7528 shares the same SPI controller and NFI DMA
engine as the Airoha EN7523/EN7581, with identical register layouts.

Using the DMA-capable SNFI driver provides significantly better
performance compared to the manual mode spi-en7523 driver.

Signed-off-by: Ahmed Naseef <naseefkm@gmail.com>
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -59,7 +59,7 @@ comment "SPI Master Controller Drivers"
 
 config SPI_AIROHA_SNFI
 	tristate "Airoha SPI NAND Flash Interface"
-	depends on ARCH_AIROHA || COMPILE_TEST
+	depends on ARCH_AIROHA || ECONET || COMPILE_TEST
 	depends on SPI_MASTER
 	select REGMAP_MMIO
 	help
