spi: change of_find_spi_controller_by_node() gating to CONFIG_OF

spi: change of_find_spi_controller_by_node() gating to CONFIG_OF

Currently, the helper of_find_spi_controller_by_node() is gated under
CONFIG_OF_DYNAMIC. This prevents drivers from using it in all CONFIG_OF
configurations.

This patch moves the gating to CONFIG_OF, keeping the inline fallback
returning NULL when Device Tree support is disabled.

Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
Link: https://patch.msgid.link/6d8ae977d9f4726ea23ad5382638750593f9a2e4.1767148150.git.oder_chiou@realtek.com
Signed-off-by: Mark Brown <broonie@kernel.org>