gpio: tegra: Allow compile test

Allow compile testing this driver by adding a new config option which
is enabled by default and depends on the old symbol or COMPILE_TEST.

Signed-off-by: Alexander Stein <alexanders83@web.de>
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 40ab913..74eb1a7 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -95,7 +95,7 @@
 obj-$(CONFIG_GPIO_SYSCON)	+= gpio-syscon.o
 obj-$(CONFIG_GPIO_TB10X)	+= gpio-tb10x.o
 obj-$(CONFIG_GPIO_TC3589X)	+= gpio-tc3589x.o
-obj-$(CONFIG_ARCH_TEGRA)	+= gpio-tegra.o
+obj-$(CONFIG_GPIO_TEGRA)	+= gpio-tegra.o
 obj-$(CONFIG_GPIO_TIMBERDALE)	+= gpio-timberdale.o
 obj-$(CONFIG_GPIO_PALMAS)	+= gpio-palmas.o
 obj-$(CONFIG_GPIO_TPIC2810)	+= gpio-tpic2810.o