esp_flash: fix cache exception when CS pin is through IOMUX

components/spi_flash/linker.lf

@@ -7,3 +7,9 @@ entries:
     spi_flash_chip_gd(noflash)
     memspi_host_driver (noflash)
 
+# `spi_bus_add_flash_device` uses these functions when the cache is disabled
+[mapping:driver_spiflash]
+archive: libdriver.a
+entries:
+    gpio:gpio_iomux_out (noflash)
+    gpio:gpio_iomux_in (noflash)