brcm63xx: drop legacy profile for SR102

Remove the sky.mk causing a duplicate device profile to be added in
image builder. The generic device code already generates a profile for
the device.

Fixes FS#1780.

Fixes: d591260407 ("brcm63xx: initial support for Sky SR102 router")
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

target/linux/brcm63xx/profiles/sky.mk

@@ -1,16 +0,0 @@
-#
-# Copyright (C) 2015 OpenWrt.org
-#
-# This is free software, licensed under the GNU General Public License v2.
-# See /LICENSE for more information.
-#
-
-define Profile/SR102
-  NAME:=SKY SR102
-  PACKAGES:=kmod-b43 wpad-mini \
-	kmod-usb2 kmod-usb-ohci
-endef
-define Profile/SR102/Description
-  Package set optimized for SKY SR102.
-endef
-$(eval $(call Profile,SR102))