drivers: flash: spi_nor: fix driver initialization error

Fix the issue that the initialization will fail when both
CONFIG_SPI_NOR_SFDP_RUNTIME and CONFIG_SPI_NOR_IDLE_IN_DPD are enabled.
The cause of this problem is simply calling the wrong function.

Fixes #33015

Signed-off-by: Xinyang Tan <xinyang.tan@delve.com>