spi: xlp: update for ARCH_VULCAN2

ARCH_VULCAN arm64 platform (for Broadcom Vulcan ARM64 processors) has
been discontinued. Cavium's ThunderX2 CN99XX (ARCH_THUNDER2) will be
the next revision of the platform.

Update compile dependencies and ACPI ID to reflect this change. There
is not need to retain ARCH_VULCAN since the Vulcan processor was never
in production and ARCH_VULCAN will be deleted soon.

Signed-off-by: Jayachandran C <jnair@caviumnetworks.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/spi/spi-xlp.c b/drivers/spi/spi-xlp.c
index bea7a93..80cb4d6 100644
--- a/drivers/spi/spi-xlp.c
+++ b/drivers/spi/spi-xlp.c
@@ -442,6 +442,7 @@ static int xlp_spi_probe(struct platform_device *pdev)
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id xlp_spi_acpi_match[] = {
 	{ "BRCM900D", 0 },
+	{ "CAV900D",  0 },
 	{ },
 };
 MODULE_DEVICE_TABLE(acpi, xlp_spi_acpi_match);