drivers/spi/spi-ad9250fmc: Revert static bus_num assignment - may conflict

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
arch/arm/configs/zync_xcomm_adv7511_defconfig: Enable Regulator framework

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
arch/arm/boot/dts/zynq-zc706-adv7511-ad9250-fmc-250ebz: Add FMC (HPC/LPC) EEPROMS & AD7291

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>