Merge changes Ib63a3920,I468af254,Iae0cc3bf,I367b3521,I3b7d64f5,I1ba2b87e into eggplant

* changes:
  qca: ipq40xx: Adding support for UART driver
  qca: ipq40xx: Enabling Makefile and Kconfig
  qca: ipq40xx: Adding dts support
  qca: ipq40xx: Adding board specific files
  qca: ipq40xx: Adding files iomap.h and gpio.h
  qca: ipq40xx: Addding smem related files