treewide: use name in define and eval lines

For consistency, use full name instead of $(PKG_NAME) in define and eval
lines for all packages.

I've seen reviews that asked to do this before, and I am asking the same
during reviews now. To avoid this in the future, fix this treewide so
when people use existing packages as example, we will not have to
request this change anymore.

This makes all packages consistent with both LEDE and OpenWrt base
repositories.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

net/adblock/Makefile

@@ -13,21 +13,21 @@ PKG_MAINTAINER:=Dirk Brenken <dev@brenken.org>
 
 include $(INCLUDE_DIR)/package.mk
 
-define Package/$(PKG_NAME)
+define Package/adblock
 	SECTION:=net
 	CATEGORY:=Network
 	TITLE:=Powerful adblock script to block ad/abuse domains
 	PKGARCH:=all
 endef
 
-define Package/$(PKG_NAME)/description
+define Package/adblock/description
 Powerful adblock script to block ad/abuse domains via dnsmasq or unbound dns backend.
 The script supports many domain blacklist sites plus manual black- and whitelist overrides.
 Please see https://github.com/openwrt/packages/blob/master/net/adblock/files/README.md for further information.
 
 endef
 
-define Package/$(PKG_NAME)/conffiles
+define Package/adblock/conffiles
 /etc/config/adblock
 /etc/adblock/adblock.whitelist
 /etc/adblock/adblock.blacklist
@@ -42,7 +42,7 @@ endef
 define Build/Compile
 endef
 
-define Package/$(PKG_NAME)/install
+define Package/adblock/install
 	$(INSTALL_DIR) $(1)/usr/bin
 	$(INSTALL_BIN) ./files/adblock.sh $(1)/usr/bin/
 
@@ -57,4 +57,4 @@ define Package/$(PKG_NAME)/install
 	$(INSTALL_CONF) ./files/adblock.whitelist $(1)/etc/adblock/
 endef
 
-$(eval $(call BuildPackage,$(PKG_NAME)))
+$(eval $(call BuildPackage,adblock))