fpga: disable pull resistors for SPI to flash chip

Shouldn't be needed, no need to waste the power.

fpga/max80.qsf

@@ -115,10 +115,10 @@ set_global_assignment -name RESERVE_DATA0_AFTER_CONFIGURATION "USE AS REGULAR IO
 set_global_assignment -name RESERVE_DATA1_AFTER_CONFIGURATION "USE AS REGULAR IO"
 set_global_assignment -name RESERVE_FLASH_NCE_AFTER_CONFIGURATION "USE AS REGULAR IO"
 set_global_assignment -name RESERVE_DCLK_AFTER_CONFIGURATION "USE AS REGULAR IO"
-set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to flash_clk
+set_instance_assignment -name WEAK_PULL_UP_RESISTOR OFF -to flash_clk
 set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to flash_cs_n
-set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to flash_miso
-set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to flash_mosi
+set_instance_assignment -name WEAK_PULL_UP_RESISTOR OFF -to flash_miso
+set_instance_assignment -name WEAK_PULL_UP_RESISTOR OFF -to flash_mosi
 set_instance_assignment -name IO_STANDARD "2.5 V" -to clock_48