fpga: Updates for 4.10

These are:
 * Add git url to MAINTAINERS
 * Allow write_init to specify how much buffer it needs
 * Fixes for ISR state in zynq fpga manager driver
 * Other small fixes for zynq
 * Add Altera SoCFPGA drivers for COMPILE_TEST
MAINTAINERS: add git url for fpga

Add git url for fpga stuff.

Signed-off-by: Alan Tull <atull@opensource.altera.com>
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