gpio: xlp: Update for ARCH_THUNDER2

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

Update compile dependencies and ACPI ID to reflect this change.

Signed-off-by: Jayachandran C <jnair@caviumnetworks.com>
[Drop depreciation of ARCH_VULCAN]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index a3b0770..a386240 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -505,7 +505,7 @@
 
 config GPIO_XLP
 	tristate "Netlogic XLP GPIO support"
-	depends on OF_GPIO && (CPU_XLP || ARCH_VULCAN || COMPILE_TEST)
+	depends on OF_GPIO && (CPU_XLP || ARCH_VULCAN || ARCH_THUNDER2 || COMPILE_TEST)
 	select GPIOLIB_IRQCHIP
 	help
 	  This driver provides support for GPIO interface on Netlogic XLP MIPS64
diff --git a/drivers/gpio/gpio-xlp.c b/drivers/gpio/gpio-xlp.c
index 7cc82cf..d857e1d 100644
--- a/drivers/gpio/gpio-xlp.c
+++ b/drivers/gpio/gpio-xlp.c
@@ -441,6 +441,7 @@ static int xlp_gpio_probe(struct platform_device *pdev)
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id xlp_gpio_acpi_match[] = {
 	{ "BRCM9006", GPIO_VARIANT_VULCAN },
+	{ "CAV9006",  GPIO_VARIANT_VULCAN },
 	{},
 };
 MODULE_DEVICE_TABLE(acpi, xlp_gpio_acpi_match);