power: reset: replace curly brackets in Makefile

Normal parentheses should be used when referring to config variables
in Makefile. Replace the accidentally introduced curly brackets by
regular parentheses.

Fixes: a7f79f99 ("power: reset: add driver for LinkStation power off")
Acked-by: Daniel González Cabanelas <dgcbueu@gmail.com>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/reset/Makefile

@@ -11,7 +11,7 @@ obj-$(CONFIG_POWER_RESET_GEMINI_POWEROFF) += gemini-poweroff.o
 obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
 obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
 obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
-obj-${CONFIG_POWER_RESET_LINKSTATION} += linkstation-poweroff.o
+obj-$(CONFIG_POWER_RESET_LINKSTATION) += linkstation-poweroff.o
 obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
 obj-$(CONFIG_POWER_RESET_MT6323) += mt6323-poweroff.o
 obj-$(CONFIG_POWER_RESET_OXNAS) += oxnas-restart.o