add missing gdbserver in SDK

Signed-off-by: Michel-FK <michel.stempin@funkey-project.com>

Author: Michel-FK

SDK/configs/funkey_defconfig

@@ -26,6 +26,7 @@ BR2_PACKAGE_GSTREAMER1=y
 BR2_PACKAGE_GST1_PLUGINS_BASE=y
 BR2_PACKAGE_MPG123=y
 BR2_PACKAGE_LZOP=y
+BR2_PACKAGE_GDB=y
 BR2_PACKAGE_E2FSPROGS=y
 BR2_PACKAGE_E2FSPROGS_RESIZE2FS=y
 BR2_PACKAGE_SDL_GFX=y