gr716: don't compile flash drv for fpga #1154

Job	Run time
call-ci / build (armv7a7-imx6ull-evk)	1m 13s
call-ci / build (armv7a9-zynq7000-qemu)	1m 51s
call-ci / build (armv7a9-zynq7000-zedboard)	1m 18s
call-ci / build (armv7a9-zynq7000-zturn)	1m 44s
call-ci / build (armv7m4-stm32l4x6-nucleo)	2m 4s
call-ci / build (armv7m7-imxrt105x-evk)	2m 10s
call-ci / build (armv7m7-imxrt106x-evk)	1m 18s
call-ci / build (armv7m7-imxrt117x-evk)	2m 0s
call-ci / build (host-generic-pc)	1m 38s
call-ci / build (ia32-generic-pc)	1m 34s
call-ci / build (ia32-generic-qemu)	1m 22s
call-ci / build (riscv64-generic-qemu)	1m 29s
call-ci / build (riscv64-generic-spike)	1m 14s
call-ci / build (sparcv8leon3-gr716-mini)	1m 14s
call-ci / test EMU (armv7a9-zynq7000-qemu)	12m 2s
call-ci / test HW (armv7a7-imx6ull-evk)	4m 43s
call-ci / test EMU (host-generic-pc)	55s
call-ci / test HW (armv7m7-imxrt106x-evk)	2m 20s
call-ci / test EMU (ia32-generic-qemu)	6m 54s
call-ci / test HW (armv7m7-imxrt117x-evk)	3m 5s
call-ci / test HW (armv7a9-zynq7000-zedboard)	5m 40s
call-ci / test EMU (riscv64-generic-qemu)	2m 56s
call-ci / test HW (armv7m4-stm32l4x6-nucleo)	7m 44s
call-ci / tests-summary	1m 3s
call-ci / send-notification	0s
	1h 9m 31s

Provide feedback