treewide: replace LEDE_GIT with PROJECT_GIT

Remove LEDE_GIT references in favor to the new name-agnostic
PROJECT_GIT variable.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

package/network/utils/iwinfo/Makefile

@@ -10,7 +10,7 @@ PKG_NAME:=libiwinfo
 PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
-PKG_SOURCE_URL=$(LEDE_GIT)/project/iwinfo.git
+PKG_SOURCE_URL=$(PROJECT_GIT)/project/iwinfo.git
 PKG_SOURCE_DATE:=2017-08-23
 PKG_SOURCE_VERSION:=c1a03e8231a5d8b348b70a182d256725c98a3b0b
 PKG_MIRROR_HASH:=7bd294f50f8ec8c0497c5fbe5527f3ae098814cdfeecf4ccf78a2a8937611664

package/network/utils/umbim/Makefile

@@ -4,7 +4,7 @@ PKG_NAME:=umbim
 PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
-PKG_SOURCE_URL=$(LEDE_GIT)/project/umbim.git
+PKG_SOURCE_URL=$(PROJECT_GIT)/project/umbim.git
 PKG_SOURCE_DATE:=2015-07-04
 PKG_SOURCE_VERSION:=29aaf43b097ee57f7aa1bb24341db6cc4148cbf3
 PKG_MIRROR_HASH:=56e612d9da1ac26de96c4929fbabd047862d725a13ceb904807a9d3d7db43a30

package/network/utils/uqmi/Makefile

@@ -4,7 +4,7 @@ PKG_NAME:=uqmi
 PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
-PKG_SOURCE_URL=$(LEDE_GIT)/project/uqmi.git
+PKG_SOURCE_URL=$(PROJECT_GIT)/project/uqmi.git
 PKG_SOURCE_DATE:=2016-12-19
 PKG_SOURCE_VERSION:=8ceeab690d8c6f1e3afbd4bcaee7bc2ba3fbe165
 PKG_MIRROR_HASH:=b3637ff04e51769137af1c5e173e73311e11c3c2dcc49eeaca6aa3520f61d247