nu801: fix DEPENDS on bcm53xx

the tacked on @TARGET_bcm53xx causes warnings:
tmp/.config-package.in:14027:warning: ignoring unsupported character '@'
tmp/.config-package.in:26028:warning: ignoring unsupported character '@'

this was wrong.

Fixes: be1761fa1488 ("nu801: add MR26 to the table")
Signed-off-by: Christian Lamparter <[email protected]>

package/system/gpio-cdev/nu801/Makefile

@@ -20,7 +20,7 @@ define Package/nu801
   SECTION:=utils
   CATEGORY:=Utilities
   SUBMENU:=Userspace GPIO Drivers
-  DEPENDS:=@TARGET_x86||@TARGET_bcm53xx
+  DEPENDS:=@(TARGET_x86||TARGET_bcm53xx)
   KCONFIG:=CONFIG_GPIO_CDEV=y
   TITLE:=NU801 LED Driver
 endef