spi: amd: Set correct bus number in ACPI probe path

spi: amd: Set correct bus number in ACPI probe path

On platforms where the HID2 SPI controller (AMDI0063) is enumerated via
ACPI instead of PCI, amd_spi_probe() unconditionally sets bus_num to 0,
while the PCI probe path assigns bus_num 2 for HID2 controller.

Align the ACPI probe path to use the same bus number so that userspace
and SPI client drivers see a consistent bus assignment regardless of the
enumeration method.

Fixes: b644c2776652 ("spi: spi_amd: Add PCI-based driver for AMD HID2 SPI controller")
Cc: stable@vger.kernel.org # v6.16+
Signed-off-by: Krishnamoorthi M <krishnamoorthi.m@amd.com>
Link: https://patch.msgid.link/20260507180051.4158674-1-krishnamoorthi.m@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>