package/pkg-meson: drop csky reference in package infra

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Guo Ren <ren_guo@c-sky.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/pkg-meson.mk

@@ -36,8 +36,6 @@ else ifeq ($(BR2_arm)$(BR2_armeb),y)
 PKG_MESON_TARGET_CPU_FAMILY = arm
 else ifeq ($(BR2_aarch64)$(BR2_aarch64_be),y)
 PKG_MESON_TARGET_CPU_FAMILY = aarch64
-else ifeq ($(BR2_csky),y)
-PKG_MESON_TARGET_CPU_FAMILY = csky
 else ifeq ($(BR2_i386),y)
 PKG_MESON_TARGET_CPU_FAMILY = x86
 else ifeq ($(BR2_m68k),y)