[FEATURE] Add Xilinx Zynq support in Linux edrv module

Signed-off-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
Change-Id: I2b8052d6bfadf90441bc8fdc853405dd7d9362b4
[FIX] Remove absolute path for Xilinx ARM Linux toolchain

This will substitutes the absolute path for Xilinx ARM Linux toolchain
to relative path using Xilinx environment variables.