package/rpi-userland: fix typo for BR2_aarch64

Commit "59adb53c4c package/rpi-userland: add support for aarch64"
introduced a typo in the condition that shows a comment in menuconfig.

Fix the typo: BR2_arch64 -> BR2_aarch64

Cc: Mahyar Koshkouei <mahyar.koshkouei@gmail.com>
Cc: Tim Gover <tim.gover@raspberrypi.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/rpi-userland/Config.in

@@ -40,6 +40,6 @@ config BR2_PACKAGE_RPI_USERLAND_HELLO
 endif
 
 comment "rpi-userland needs a toolchain w/ C++, threads, dynamic library"
-	depends on BR2_arm || BR2_arch64
+	depends on BR2_arm || BR2_aarch64
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS || \
 		BR2_STATIC_LIBS